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Old 10-19-2019, 01:18 PM   #1
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Fish dying

So i've had my 55 up and cycled and running with fish for months. After my one Molly got sick i decided to rehome the other 2 and replace with a school of 10 black neons. Everything was fine. A couple of weeks later I added 5 otocinclus and as predicted i lost 1 within a week but the other 4 were happy and healthy. On sunday I added 6 cardinal tetras and this is where everything went downhill. My total stocking at this point was 10 black neons, 3 female platys(+fry), 6 cardinals and 4 otos

Wednesday: wake up to find 2 dead, did a small water change and went to the store to replace them. Added 2 more female platys because mine were getting shy.
Thursday: wake up to find 2 more cardinals dead. Went back to the store and instead of replacing them i ask if i can get a plant instead (he was nice and let me)
Friday: wake up to find an oto dead
Today: Wake up and found another oto and cardinal dead. Finally had time to get my water tested.
Ammonia 0
Nitrites 0
Nitrates 0 (surprised me)

So I don't have any nitrates showing up. Is my tank going through another cycle killing off more sensitive fish? I did just replace my filter from a HOB to a canister.

OR

Is my tank too understocked to produce the necessary amount of waste for nitrates to show up? Are my water changes too big (approx. 50% a week)
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Old 10-21-2019, 06:37 PM   #2
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Sounds like an illness going through the tank from the more recently introduced fish.

Do the fish seem to have any physical tell tale signs?

QT tank is always a safer bet.

Do the fish seem to be breathing faster than normal, have grey or brown or flaming red gills? and discolored spots, patches, tiny salt looking specs?
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Old 10-22-2019, 07:21 AM   #3
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None of those symptoms, the black neons even let them school with them. I didn't have a separate at tank set up due to lack of room. I'll be setting one up as soon as I get my betta tank emptied and cleaned. They are impossible to catch in the 55 as well.
No fish have died since Saturday.
I think with the cardinals he must have just got them in the store and I bought them before they had time to acclimate to their tanks before going into mine. I have 3 surviving cardinals doing great.
As for the otos, I don't know, I seem to have bad luck with scaless fish.
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Old 10-23-2019, 01:15 AM   #4
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Otos are sensitive to the transporting process and acclimating to the new environment.

They could have been through 4 changes from the origin wholesaler, to the middle man seller, to the fish store to your tank. That's a ton of stress!

My last group had lost all the fish I got at one store one by one, even though they seemed to be eating. My previous 2 purchase survivors seem okay. But they are still in QT. Frustrating though for sure.
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Old 10-23-2019, 02:30 PM   #5
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They aren't cheap either, otos are like $4.99 each here.
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Old 10-24-2019, 01:15 AM   #6
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They are 2.99 or 3.99 here usually. Any deaths without replacements tend to really add up too.
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