Fish Keep Dying In Cycled Tanks

sross78

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I have two cycled tanks, a 55 and 30 gallon. The past few days I have had several deaths in each tank and just can't figure out why. Both tank parameters are essentially identical.

Freshwater, 77 degrees, PH 7.6, 0 ammonia, 0 nitrite, 5 ppm nitrate.

- 55 gallon has 4 angelfish, 4 rainbowfish (1 died last night), 2 roseline sharks (1 died the day before), 1 swordtail. 2 aquaclear 50 HOB filters and two small internal sponge filters.

- 30 gallon has 4 neon tetras, 2 dalmation platys, 2 red platys, 2 dwarf rainbowfish (1 died last night), 1 sowrdtail. 2 other small rainbowfish died several days ago. 1 Fluval U3 filter and 1 airstone.

I am at a loss, all the water tests tell me the tanks are just fine. Could it just be stress? I did notice one roseline shark really chasing the other the day before that one died so I chalked that one up to aggression but last night a bosemani rainbowfish died too and I know the last roseline wasn't chasing it.
 
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sross78

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i have been adding a 2-3 each week to each tank and had them "fully" stocked before everything starting going south with both tanks. All fish were purchased from LFS with great stock so I don't understand all the sudden deaths. Last water change on both tanks was sunday at roughly 50% each. Water parameters have remained steady from testing and all new stock seemed fine as they were added. I did introduce frozen bloodworms as food yesterday at the recommendation of the LFS b/c two of the recently added yellow rainbowfish were not eating the flakes/pellets after 3-4 days in the 55 gallon.

This is just so frustrating as I thought I had these two tanks stocked and healthy for years to come but alas find myself in this strange situation.
 

Ltreg11

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I have been having the same issue... following. 55gal. understocked. Recently ordered a tank filter - thinking maybe the aqueon hang over the tank isn't cutting it. I do also have 2 bubble sticks.
 

Kasshan

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large waterchanges could have killed your fish. compare your tap water chemistry to your tank's chemistry. I could be completely wrong. I think water changes can be dangerous if you don't pay attention to the pH, temperature, other various chemistry of the new water you add. I would suggest smaller water changes. a smaller water change would not cause such a big swing.
 
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sross78

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I have been having the same issue... following. 55gal. understocked. Recently ordered a tank filter - thinking maybe the aqueon hang over the tank isn't cutting it. I do also have 2 bubble sticks.
appreciate the reply but please don't divert this thread down another path. Please post other info about your tank in a different thread to solicit responses, thanks

large waterchanges could have killed your fish. compare your tap water chemistry to your tank's chemistry. I could be completely wrong.
I am going to immediately cut back to once a week 25% water changes in each tank but have been told otherwise in other threads that it makes no difference...
 
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Kasshan

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were all the parameters I mentioned in check? pH, temp, etc.
then you can safely ignore my thoughts. but large waterchanges, like 50%, have historical killed fish for me. take my advice with a grain of salt tho, I'm in the minority. if i was ever personally forced to do a waterchange, it would be small and frequent, like 10% a day. its better scientific procedure.

i feel big water changes (when done improperly) can stress fish. I hope its not a disease, but it doesn't sound like it.
 
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Ltreg11

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appreciate the reply but please don't divert this thread down another path. Please post other info about your tank in a different thread to solicit responses, thanks
Only suggesting it may be your filter - scross78 - did you mention what you use?

And I apologize, you did.. I'm new.. adios.
 
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I started my tank with only plants for 2 weeks and made sure I would get all the stock I wanted for the tank with no exceptions and no later additions to it and purchased a couple bags of Freshwater Bio Spira from Drs. Foster & Smith and added right (within seconds) after adding all my fish. I did not do any water changes for a whole week and since then the tank has remained cycled and no occupants have been lost. I have a 29 gallon with 8 Harlequin Rasboras, 8 Julii cories, 4 Pineapple Platies, and 7 Olive Nerite snails. It is filtered with 2 sponge filters rated for 30 gallon tanks and a Fluval C3 filter with carbon and Purigen in the mechanical filtration slot. This is just for information in case any of it will help. Thanks for listening.
 
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