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Discussion Starter · #1 ·
Ever since I changed filters from a tetra whisper filter to my aquaclear filter, I have had 4 fish die in the last month and a half. Not sure if this is a coincidence or not.

I tested my water and all levels seem to be within normal range except for the carbonate hardness. All of a sudden it is through the roof at 240 mg/L. I perform water changes every 2 weeks and never had a problem until lately.

I have had a swordtail, female betta, 2 gouramis due recently. My other fish (zebra loach, dojo loach, pleco, pictus catfish, paradise gourami, powder blue gourami, and silver gar) are doing just fine, luckily.

Any suggestion and advice would be greatly appreciated.
 

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Discussion Starter · #3 ·
Did you put the media from the tetra filter into the new aquaclear? If you didn't you could of easily sent your tank into a mini cycle. Can you post water stats with numbers, regardless if its okay or not. Also what test kit are you using.

BTW you have some very incompatible fish sharing that tank, which could be the reason for the fish loss. If it isn't now it will be down the road when they start eating each other.
I did not put the media (you mean filter?) from the tetra filter into the new aquaclear. I just did a straight up change of filtration systems. The test kit I am using is the 5 in 1 test strips from API. Yes it is an odd combination of fish but they actually get along just fine.

Water Stats

GH 60 ppm
KH 240 ppm
PH 7.0-7.2
Nitrite 1 ppm (lower end of spectrum)
Nitrate 40 ppm (lower end of spectrum
 

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Discussion Starter · #4 ·
This may explain the fish dying now that I think about it..I just read up on this and yeah what I did is a no no..but this does not explain the carbonate hardness levels though.. hmm
 

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Discussion Starter · #6 ·
Thanks for the info. My tank was due for a water change tomorrow anyway and maybe that's why my nitrite levels were a little high? I have had the new filter for 6 weeks I guess the cycle is not quite complete. Is this also the cause for my carbonate hardness to increase? It seems my bottom fish and my gar are quickly more adaptable than my other fish..hmm
 

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Discussion Starter · #8 ·
Thanks again. I just bought another biomax media and will be taking out my carbon and running two biomax medias along with the aquaclear sponge. I heard that should at least help more with the nitrite problem. In the meantime water changes it is until the cycle is complete.
 

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Discussion Starter · #11 ·
Thanks JDM My tank is a 15 gallon tank. Will be doing a 50 percent water change today and smaller water changes on a daily basis until I get the nitrite level down to 0. Yes, I am Prime so it does include eliminating ammonia. I just had another fish die on me so down to 6 =/. I wish I had done the filter swap the right way from the begining.. but oh well nothing I can do about it now except for this. How long do you think it will take to get the nitrite down to 0?
 

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Discussion Starter · #14 ·
Sad to say another fish died.. my paradise gourami. I am down to 5 fish now. The remaining live fish I have had between 3 months to 2 years and with my old tetra whisper filter before I made the switch. However, the fish that I did add after I made the filter switch to aquaclear, all of them died which i guess now that I read this is not surprising since I threw my tank into another cycle. As for the test kit, is this a good one to use vs the test strips? Amazon.com: API Freshwater Master Test Kit: Pet Supplies
 

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Discussion Starter · #16 ·
Yes, that is a very good test kit.

Sad to hear that you are still losing fish. Depending on a lot of things they could just be succumbing to damage already done and there is nothing that you can really do for that other than to keep treating and changing the water so it is as good as you can provide.

Jeff.
=(. Well at this point I hope the cycling completes ahead of schedule.. In the meantime will do what I can to save the fish I have. Wish me luck! Will keep updating as necessary..lol this is starting to turn into a blog haha.
 

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Discussion Starter · #18 ·
I had pet supermarket test out my water.. figure why not since I was there getting my reptiles food. Not surprisingly.. everything checked out ok.. Ammonia levels were at 0 along with nitrites.. The fact i did 50-60% water change probably is the reason why but will wait a few days and test the water out and see how it is then. I may have lucked out or at the tail end of the cycle. Hopefully this continues to hold :) Some encouraging news at least.
 

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Discussion Starter · #19 ·
It is Friday and tested the water out again because I am crazy like that lol.. 0 Nitrite and 0 Ammonia. The remaining 6 fish are doing just fine as far as behavior and what not: silver gar, white skirt tetra, zebra loach, bushelnose pleco, dojo loach, and pictus catfish. Odd mix yes but they actually get along quite well and have been for some time.
 

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Discussion Starter · #20 ·
Tested the Water today for ammonia using the API liquid drop test as before and it is some where between 0 and 0.25 ppm.. Based on the color it is more on the yellow spectrum and if I had to estimate id say 0-10 ppm. This tells me a water change is needed today.. How much of the water should I change though after I did a 50% water change last Wed?
 

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Discussion Starter · #22 ·
0-10ppm.... I assume this is the nitrate reading? A good goal is to aim for 10ppm as the maximum as the lower the better for the fish. I aim for 5ppm b it it is very easy for me as my tank does not create enough nitrates to worry about, I've never measured over 5 yet and I have skipped a few WCs ,along the way.

Maybe just set your schedule changes and start now... 25% at least. I always think that once you get the change going, 25% or 50% is just a matter of a few more minutes draining or filling so why not go for 50% all the time?

Jeff.
That is correct. Good advice will schedule my changes at this point. Many thanks. I think the worst is behind me :) No fish deaths since last Wed when my ammonia levels were spiking (presumeably). Still going to wait another 5-7 days before I start buying more fish just to be absolutely sure my tank remains stable.
 

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Discussion Starter · #23 ·
Happy to report that I have 0 Nitrite and 0 Ammonia in my tank =D. Nitrate levels are withing appropriate levels and with my routine water changes should not be a problem.

No fish deaths as of 2 weeks when Sh*t started to hit the fan. Will be buying a few new fish soon and see how they do.
 
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