Our fish are dying. - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 38 Old 09-21-2010, 09:18 AM Thread Starter
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Our fish are dying.

Hi -
My name is Suzanne and I just joined this forum.

We bought my daughter a 12 gallon tank for Christmas. It is our first tank. Once we got the tank cycled, everything has been going great. However, the past few weeks, we have lost 3 fish. Some details about our tank:

I test the water weekly and the tests are coming back fine. I change the water weekly and my daughter cleans the algae with an algae scraper. However, we are still losing fish.

Before the problem started, we had 2 platies, a zebra danio and 2 corydora catfish. One of the platies died and we bought two more. The two new fish only lived a week or two. Now, one of our corydora catfish is dead.

I am at my wits end. I don't know what else to do. What could be killing our fish? Before the first platiie died, we hadn't lost any fish since the tank cycled.


Thank you for any input you may have.

Suzanne
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post #2 of 38 Old 09-21-2010, 09:30 AM
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How do you test your water? Will you post the exact from your tests? Ammonia level? Nitrite level? pH? Water temperature? And any other info you can give us? The more you let the forum know about your tank, we'll get a better idea at what might be wrong.

I'm so sorry for your lost fish. That really stinks. I hope someone on here will know what happened so it won't happen again. Have any of your fish been acting funny or lethargic?

As for now, my advice would be to do a partial water change and test everything again. Keep a close eye on your remaining fish and let us know how they are doing. Sorry I don't know more, I'm brand new at this.

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20 gal long-otos, glowlight tetra, black phantom tetra, African dwarf frogs
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post #3 of 38 Old 09-21-2010, 09:49 AM Thread Starter
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Thank you. Here is some additional information:

I test my water using the API Freshwater Master Test Kit.

The PH - 7.0
Ammonia - 0
Nitrite - 0
Nitrate - 0

The water temperature is 78.9

My tank is an Eclipse 12 and we change the filter about every two weeks.

The remaining fish seem to be okay, but I noticed yesterday that they didn't eat as much as they usually eat.

Suzanne
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post #4 of 38 Old 09-21-2010, 09:52 AM
Age of tank. Any strange growth, or behavior of the fish? Also types of decor, food, and chemicals used in tank setup could help. Also is the water cloudy or is it clear?
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post #5 of 38 Old 09-21-2010, 10:58 AM Thread Starter
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The tank is 9 months old. The water is crystal clear, but we have had issues with algae. We have a castle and an anemone made out of hard material. We have 2 plastic plants. The surface is covered with gravel.

We feed the fish - tropical fish flakes and sinking shrimp pellets.

The remaining fish act normal, but they are eating less than usual.

We use Prime Water Conditioner and Algaefix when we change the water.


thank you.
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post #6 of 38 Old 09-21-2010, 12:55 PM
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Well I don't think this is directly responsible, but I wouldn't use the algae fix. Prime is good...

The thing really bugging me is that your ammonia nitrites and nitrates are all 0... That never happens... Any kind of special filter media?

Do you have live plants?

Do you vacuum the substrate?

Could you take a water sample to a lfs and get a second opinion on the test results?

When you change the carbon in the filter, do you clean the bio-filter? (Most people on here don't use carbon, but again, it's not the priority or the cause)

Are there any symptoms at all before the fish die?

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post #7 of 38 Old 09-21-2010, 01:06 PM Thread Starter
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I have thought about taking a water sample to the pet store. Maybe, I will do that. I followed the instructions with the kit exactly and I haven't ever had any trouble testing before. When we were cycling the tank, the levels all fluctuated, but they seem really stable now.

We just use the filter that is recommended for our tank.
We do not have live plants.
I do vacuum the substrate when we do a partial water change. We do it weekly.

Only the two new fish that died showed any symptoms. One just never seemed healthy. The other started hanging around the filter all the time right before he died.

The Cory that we just lost was always a little strange, but we had him for several months.

I don't clean the bio-wheel. I read that it doesn't need to be cleaned or changed frequently.

If we don't use the Algaefix, what would we use to help with the algae. We started using it this summer because there was so much algae. It seems to help, but is it hurting the fish?


Thank you,

Suzanne
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post #8 of 38 Old 09-21-2010, 01:45 PM
Quote:
Originally Posted by Suzanne115 View Post
Thank you. Here is some additional information:

I test my water using the API Freshwater Master Test Kit.

The PH - 7.0
Ammonia - 0
Nitrite - 0
Nitrate - 0

The water temperature is 78.9

My tank is an Eclipse 12 and we change the filter about every two weeks.

The remaining fish seem to be okay, but I noticed yesterday that they didn't eat as much as they usually eat.

Suzanne
nitrate shouldn't be 0 if the tanks healthy and cycled .filters can't always be changed cause it contains beneficial bacteria to help the tank cycle. i don't think your tank ever cycled if you kept changing the filter since the first day you got it. if your tank din't cycle there should be and ammonia spike which is weird since ammonia reads 0.which makes me think there's poisoning going on in the tank or theres something wrong with your test kit. do you test after or before water changes? algae problems come from too much nutrients in the tank.a single plants will help to soak up nutrients and heavy metals in the water. clean the filter media only with old tank water not tap water. dump some carbon in the tank for the ime being it will help soak up and unwanted chemicals in the water.

5x2x2 aro,highfin bat,fei feng,ST,albino tinfoil,c.perch
4x1.5x1.5 planted tetras,harlequins,
otto,WMM,2 types of celebes rainbows,rcs,amano, bamboo,red ramhorns,MTS
3.5x2.5x2 flowerhorn,pleco
3x1.5x1.5 russel's lion,blue cleaner,sixline and leopard wrasse,maroon clown pair,green chromis,scorpion,tiger cowrie,turbo,lyretail anthias,jewel,anemone,star polyp,marbled and giant green mushi,zoa
2x1x1 nano sw shrimps
22 May 2012
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post #9 of 38 Old 09-21-2010, 01:47 PM
2 platies, a Zebra Danio and 2 corydora catfish.

ph is a bit high for cory's, you should keep at least 6 danios and cory's as they a schooling fish.

5x2x2 aro,highfin bat,fei feng,ST,albino tinfoil,c.perch
4x1.5x1.5 planted tetras,harlequins,
otto,WMM,2 types of celebes rainbows,rcs,amano, bamboo,red ramhorns,MTS
3.5x2.5x2 flowerhorn,pleco
3x1.5x1.5 russel's lion,blue cleaner,sixline and leopard wrasse,maroon clown pair,green chromis,scorpion,tiger cowrie,turbo,lyretail anthias,jewel,anemone,star polyp,marbled and giant green mushi,zoa
2x1x1 nano sw shrimps
22 May 2012
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post #10 of 38 Old 09-21-2010, 01:56 PM Thread Starter
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I am totally confused now. My instructions with my tank were to change the filter on a regular basis. I usually change it every two weeks. I don't change the Bio-Wheel because it doesn't need it and I thought cleaning it would destroy the beneficial bacteria.

I do rinse the new filter with clean water. I had never heard anything about not doing it that way. I will start using water from the tank for that.

I test before water changes. If the ammonia or nitrite level is high, I retest after the water change.

We haven't had ammonia or nitrite problems since March or April. I don't understand how the tank could be cycling when the ammonia and nitrite levels have been so good for months.

I listed the nitrates as 0 because the color most closely matched zero, but it was a little darker.

Suzanne
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