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Discussion Starter #1
I have a 29 gallon that crashed a couple of months ago. I had a surviving bristlenose pleco and a cherry shrimp. Since then my tank has remained cycled. I got the tank back up to par and added 3 neon tetras and 2 glowlight tetra two months ago. One glowlight died, I'm assuming it had issues when I purchased it. In any case I waited a couple of weeks to add more fish. One week ago I purchased two peacock gobies, two neon tetras, two cherry shrimp, and an assassin snail. Normally I wouldn't add so many fish at once, but have added several new plants at the same time and water parameters have remained unchanged.
Two days after the purchase I lost a neon, the next day I lost another neon, etc. Yesterday two fish died and today two more. All in all I lost my BN pleco whom I've had for several months, 1 cherry shrimp, my glowlight tetra, and 5 neon tetras within this one week. I am baffled and have no idea what's going on. My only theory is that the gobies could be killing them, although I haven't seen them attack at all. I tested my water levels yesterday with my API kit and Ammonia, Nitrates, and Nitrites are all at 0. The fish haven't looked sick at all, I just find them dead. I've never lost fish like this before, other than my tank crashing due to my own negligence in the past and I'm frustrated and not sure what the problem could be and don't know if I should take the gobies back or not. They are a male/female pair but I haven't seen them act aggressive at all. The only thing I've done differently is add an appropriate dosing of seachem flourish a week ago with a 20% partial water change, which I have always done. I wondered if it was the flourish but thought if it was I would have lost all of the shrimp and they would have gone first. Any advice would help.
 

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sounds to me as if you have a disease in your tank...probably columnaris, especially if you don't see any outer symptoms and your fish are just dropping dead without any warning or outer signs.

it is definitely not the gobies...you have an illness in your tank.

honestly, i would probably start a salt treatment for columnaris immediately, while keeping a strong, detailed eye on EVERYTHING left alive in the tank. remove the plants if you're using salt, and remove the snail for ANY treatment. whatever disease is in there, the snail won't get it and the plants can be added back into the tank after 2-3 weeks of quarantine in CLEAN, nonchlorinated water (with changes 2-3x per week).
 

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Discussion Starter #3
Also I forgot to add temp is at 78, I have a marineland bio wheel 200 rated for 50 gallons, and currently left are my two peacock gobies, an assasin snail, a mystery snail, and two cherry shrimp. PH tested at 8.6. I know it's high but successfully acclimated a GBR and Angel and they thrived before my tank crashed, not to mention I've had the first few tetras for quite a while before the new additions when everything started dying off.
 

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Discussion Starter #4
Is there any way to know for sure? I don't want to add extra chemicals if it's not absolutely necessary.
 

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Discussion Starter #5
I googled it and it talked about frayed and ragged fins, ulcerations, musus, and white or cloudy fungus patches. The fish haven't displayed any of those at all and weren't discolored at all. They looked totally normal and were eating and active before dying.
 

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Discussion Starter #7
Also the reason I was curious about the gobies is because it said they can become aggressive if they spawn, although I haven't seen it. But the 1st neon that died earlier today as down by their driftwood cave right next to it, that's also where I found another dead neon, and the glowlight tetra that I found dead was in their cave. Not trying to dispute anything you are saying, just trying to ask questions and make sure I give you as much info as I can.
 

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i have the exact same symptoms as you do in my new guppy tank. my tank has been fully cycled for over a year, being occupied ONLY by trumpet snails. then i introduced some store brought guppies into the tank last friday. by tuesday of this week, i had lost 9 out of 15 fish. the females were displaying signs and symptoms:

dropsy (bloat)
crusty mouth

they only showed those two signs. otherwise my dead females were fine.

the males however, were dying without showing ANY visible signs. they were just fine looking, and were dying left and right.

it was like a massacre. everyone would be fine. then i'd turn off the light for the night...turn it back on the next morning, and have 1-3 dead fish. some would float, some would sink.

so as you can see, i definitely had a hard time identifying my disease because some fish had no symptoms, one had dropsy, one had crusty mouth, one had been henpecked by the other fish so his tail was destroyed. some died slowly, and some died super fast. my crusty mouthed female actually died WHILE i was changing the tank water! super fast.

also, columnaris CAN have those signs and symptoms, but it also can be a silent killer with no symptoms at all.
 

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If I take out all the plants and put them back in later won't it recycle the tank?
your plants should be in quarantine anyway...they CAN carry disease i do believe. quarantining won't hurt them...and as far as i know, once your tank is properly cycled, there is no "recycling" it...the plants won't disturb the tank's cycle as long as you introduce them sloooowwwly.

quarantining your plants and rinsing them off in CLEAN unchlorinated water every 2-3 days will do two things:

wash off any disease they are carrying.

keep them refreshed while away from the fish and healthy aquarium.

giving a 21 day quarantine will pretty much guarantee the death of many germs hanging onto the plants.
 

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Discussion Starter #10
Sorry to hear about your tank too. What are you using to treat your tank? I can't take the plants out of mine, not just for fear of the cycle crashing but also because I don't have the money for a spare tank right now. I had a couple but they got damaged. :(
 

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Discussion Starter #11
Oh I meant like won't the cycle crash if I take them out all at once? Also the newest plants I added didn't come from previous tanks. They were the prepackaged ones that have the gel on them. I got them individually packaged from petsmart.
 

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I googled it and it talked about frayed and ragged fins, ulcerations, musus, and white or cloudy fungus patches. The fish haven't displayed any of those at all and weren't discolored at all. They looked totally normal and were eating and active before dying.
my fish have only one of the symptoms of columnaris:: ulcerations. and to be honest, if you didn't look SUPER closely, you would miss it. the ulcers were VERY VERY VERY tiny on my TWO fish's mouth. yes, i noticed ulcers on the mouth of ONE fish right before she died and the tiniest ulcer on another. literally the size of a speck of dust! out of 15 fish! i had assumed that all the fish would be looking horrid but i was wrong. i had to really, really search them well to see what was wrong.

this is why observation is so important. because sometimes you'll miss signs and symptoms if you don't look very closely at your little buddies. and bein that they are sooo small, some signs are hard to spot.
 

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Discussion Starter #13
Do all fish with columnaris die? Because if that's what's wrong and it's in their system I'm guessing that by the time I get medicine it'll be too late. We have freezing rain here tonight so I can't go anywhere.
 

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Discussion Starter #14 (Edited)
I know that's right. I've made sure to inspect all of the fish that I've pulled out. Except for my bristlenose. They really tore him up. I came home and found him and the poor guy was literally mush with some of his insides hanging out. Something must have been going to town on him.
 

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Oh I meant like won't the cycle crash if I take them out all at once? Also the newest plants I added didn't come from previous tanks. They were the prepackaged ones that have the gel on them. I got them individually packaged from petsmart.
ahh yeah, i get it. but wont they die if you treat them with a chemical? they would need removal anyway, or no?

perhaps someone with plant knowledge can better answer this than i can!
 

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Do all fish with columnaris die? Because if that's what's wrong and it's in their system I'm guessing that by the time I get medicine it'll be too late. We have freezing rain here tonight so I can't go anywhere.
without treatment, yes they will all die.

you can save who is left with treatment. but because you have a varied tank, what works on one life may kill another so thats another thing to consider. more than likely, with a chemical, your plants and snails will have to come out of the tank or theyll die during treatment.
 

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poor guy. but with aggressive fish, if they are the ones doing the killing ALL of the fish will show signs of injury and being attacked, ALL of them. if you just have dead fish on your hands without them looking attacked, i can almost bet it's not your gobies.
I know that's right. I've made sure to inspect all of the fish that I've pulled out. Except for my bristlenose. They really tore him up. I came home and found him and the poor guy was literally mush with some of his insides hanging out. Something must have been going to town on him.
 

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Discussion Starter #18
Thought of something else I was curious about. I have sand as my substrate. When I added my new plants I did some rescaping. I read about anaerobic gas being released from sand and killing fish. Is that also a possibility or if that was it would they all have died at once?
 

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Discussion Starter #19
Well all of them except for one was being nibbled on when I found them, I just haven't noticed anything wrong with them prior to finding them dead. The bristlenose was on the other side of the tank but constantly munching on the driftwood. I also read that the peacock gobies may be too aggressive to co exist with the neons. Also there is one neon tetra and 1 shrimp that I didn't even find the bodies of. They just disappeared. I moved the driftwood and everything and no trace. That's why I was curious about the gobies picking them off. That and 2 of them were right next to their cave and the glowlight was in it. I just wasn't sure if it was just a coincidence or not.
 

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wow! now that could also be a possibility! you should definitely take this question to the planted aquarium forum also! i have small rocks *not pebbles, ROCKS lol* as my substrate so i can't answer this. my mom has a sand substrate and has never had these problems, but it definitely could be.

from what youre describing it sounds exactly like the issue my tank was/is facing now, so this is why i said treat for disease. but certainly, if anything kills fish, you hav to rule it out of your tank before moving on!

definitely research this and ask in the planted forum!
Thought of something else I was curious about. I have sand as my substrate. When I added my new plants I did some rescaping. I read about anaerobic gas being released from sand and killing fish. Is that also a possibility or if that was it would they all have died at once?
 
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