Agresive penguin tetras??? - Tropical Fish Keeping - Aquarium fish care and resources
 
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post #1 of 9 Old 11-04-2011, 09:20 PM Thread Starter
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Agresive penguin tetras???

I have ,had nine penguin tetras but one just died.I have noticed that there were a few that had been chasing some of the what looks like the smaller ones but payed no attention to it.Do you guys think the bigger one picked on him too much.There are also still some big ones chasing after some of the small ones,is it ok? I also have two corys, one bristlenose,five silver dollars,five lemon tetras,and recently just got eight koi angelfish about a month ago theyre about nickle size. Just did a water test.Ammonia=.25,Nitrite=0,Nitrate=5.0,PH=7.4

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post #2 of 9 Old 11-05-2011, 11:11 AM Thread Starter
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I have ,had nine penguin tetras but one just died.I have noticed that there were a few that had been chasing some of the what looks like the smaller ones but payed no attention to it.Do you guys think the bigger one picked on him too much.There are also still some big ones chasing after some of the small ones,is it ok? I also have two corys, one bristlenose,five silver dollars,five lemon tetras,and recently just got eight koi angelfish about a month ago theyre about nickle size. Just did a water test.Ammonia=.25,Nitrite=0,Nitrate=5.0,PH=7.4
Just found my plecos died sat morning.I forgot to mention that i lost my one cory about four weeks ago and one lemon tetra about two and ahalf weeks ago then the penguin three days ago and now the plecos REALLY DONT KNOW WHATS GOING ON!!!!I do know that it all started when I got the anglefish.I ordered them online.Dont know if thats importent or not but my fish seem to be dying one by one.At first I thought I might be feeding them to much so I fed them less with the first two dying then when the penguin died i thought the others were harrassing the smaller ones but now the plecos well Im stumbed now.Ill appritiate any thought to what might be going on.THANKS.
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post #3 of 9 Old 11-05-2011, 12:17 PM
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How big is your tank?

PS Silver dollars can get to the size of a dinner plate, I would suggest finding a new home for them, as they will eat the tetras.
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post #4 of 9 Old 11-05-2011, 02:32 PM
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So hello! You're come to the right place, we'll do our best to help you!

How old is your tank? I see that you have an ammonia reading, have you been doing 50% water changes when you see ammonia? If not, I would do that immediately. Do you have any decaying mater (fish or plant) in the tank? Perhaps the dead fish caused the ammonia, perhaps its because you're having a mini cycle with the addition of the new fish. If you can give us some more information about dates, readings, plant load, filtration, water change schedule, etc., maybe we can help you more. For right now, that big water change is very important!

P.S. There are other problems we can address in a bit (e.g. shoal size, compatiblilty, predation, etc) but please do know that with JUST the 8 Angelfish and 5 Silver Dollar and counting NO other fish, I fear that you are way too overstocked. I know you want a healthy aquarium with healthy fish, so we can look at those issues after we get you past your ammonia problem. We're here to help!

"My dither fish need dither fish!"
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post #5 of 9 Old 11-05-2011, 06:59 PM Thread Starter
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My tank is 100 gallons and I started my tank the beganing of june.I clean the gravel,one third water change and clean the filter XP4 once a month and one third water change every two weeks.In my filter i have the sponges the filter come with,second tray I have a small amount of carbon ,the third tray i have bio stars,and the last tray I have bio ceramic rings.No live plants.THANKS for the help.
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post #6 of 9 Old 11-05-2011, 07:24 PM
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You need to increase the water changes. Once a week at minimum, and as you have no live plants this is even more critical. I would change 40-50% of the tank weekly, no less. No problem cleaning the filter monthly, if by this you just mean rinsing all the media but not replacing it. I have a Rena XP3 on my 115g and I find it needs rinsing out every 4-6 weeks or it gets so clogged the water flow reduces noticeably.

To answer you initial question; it is normal for shoaling fish to have a pecking order or hierarchy within the group. That is why they need the group. Most species don't usually kill each other (Tiger Barb and Serpae Tetra can), it seems like "play " to us and to the fish it might be that or it might be pretty serious stuff. Anyway, that is normal behaviour and in sufficient space (a 110g is sufficient) and with a decent sized group (original 9 was that too), the interactions between fish should not be problematic.

As for the recurring fish deaths, I won't speculate.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #7 of 9 Old 11-05-2011, 07:42 PM Thread Starter
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Thanks for the advice and what plants would you suggest Ilike the floating plants but I do know that the SD's like to eat certain plants and would that help the ammonia or just do the water changes you suggested.
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post #8 of 9 Old 11-06-2011, 12:27 PM
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Thanks for the advice and what plants would you suggest Ilike the floating plants but I do know that the SD's like to eat certain plants and would that help the ammonia or just do the water changes you suggested.
Plants consume a lot of ammonia as ammonium. This is why in planted tanks the nitrifying bacteria are actually in fewer numbers; the plants grab the ammonia faster. Floating plants are the best at this because being at the surface the leaves are able to assimilate carbon as CO2 directly from the air which is faster than from water, plus they are closer to the overhead light. This means they grow faster and thus assimilate more nutrients including ammonia.

The Silver Dollar are a real problem, as they will eat most tender or fine-leaf plants, and floating plants tend to be tender. Water Sprite is ideal; some stem plants can be left floating, Brazilian Pennywort creates a wonderful effect floating. But again the SD might view these as lunch.

SD are not good companions for angelfish largely because of the plants. Angelfish are quiet fish that require lots of cover and floating plants are ideal for this. Substrate plants good with angels are any of the sword plants (Echinodorus species). The pygmy chain sword is perfect as substrate cover. Lots of wood/branches with a few of these plants would look stunning in a 100g tank.

I would consider rehoming the SD and having the angels with groups of shoaling fish. This could be a very lovely display.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #9 of 9 Old 11-06-2011, 05:36 PM Thread Starter
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Thanks for the advice and I was thinking of finding another home for the SD's.The more I get into this hobby the more I start to realize the different chararisticts in every fish.Its really interisting the more I learn about one fish than find out more about another one.Its all great.Thanks again and I just finished a40 to 50 percent water change today around lunch and plan on doing it every week.I really like the floatng plant look plan on getting some after I find a home for the SD's.
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