Made a mistake and my fish all got sick. What next? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 07-20-2018, 03:08 PM Thread Starter
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So I’m new to all of this and I made a mistake. After cycling my 55gallon planted tank, I went to my LFS and bought some Bloodfin (12) and serpae tetras (8)and (6)Cory’s. I spread the purchases out by a few days to help with not spiking ammonia. Well, I didn’t QT them first and put them right in my tank after acclimation. After a few days many of the tetras were sick. Looked like cotton mouth mostly and some hole in the head, no signs of ich I think. I treated the entire tank with API Erythromycin and General cure. The tetras have been dying off so I think I caught it too late. The Cory’s still look very healthy.
What should my next steps be? My cycle is still fine, which is great. I plan to QT all fish from now on but how do I go about making sure my tank isn’t still full of disease to new comers? How do I disinfect without killing off my cycle or plants/snails?

My parameters are this below and I’ve been doing many water changes during meds
0 ammonia
0 nitrite
<20 nitrate
6.6 ph
Set my water temp to ~80F from my normal which was ~75F
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post #2 of 8 (permalink) Old 07-20-2018, 07:22 PM
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Are you sure it was cycled? Why are you running it so hot? Please explain how it was cycled enough for 26 fish? Then you can give size of tank and all that jazz.
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post #3 of 8 (permalink) Old 07-20-2018, 07:37 PM Thread Starter
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Originally Posted by unclefred View Post
Are you sure it was cycled? Why are you running it so hot? Please explain how it was cycled enough for 26 fish? Then you can give size of tank and all that jazz.
Iím fairly certain itís cycled. I have tested (api kit) every day for many weeks from the start of the tank to now. I did a fishless cycle with ammonia. I got to the point where I could bring the tank to 2-4ppm and the following day have 0 ammonia and 0 nitrites and obviously some nitrates depending on when I last water changed. From what I understand that is cycled. I may be wrong though, idk. I added the fish slowly and let everything stay stable for a few days before adding more fish, this wasnít all at once. Days after all fish were in there I still had 0-0-~20. So I feel it was cycled fine.

As for the temp. I really donít have a good answer. I read a slightly higher temp can help things a little bit, especially if I did end up with ich, which I donít think I have.
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post #4 of 8 (permalink) Old 07-23-2018, 12:23 PM
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Rather than tell you what I think about your situation, to answer your original question: Nothing, until you see some actual signs of disease.
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post #5 of 8 (permalink) Old 07-23-2018, 04:42 PM
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Sounds like you are cycled and have been carefully monitoring your levels well for rising ammonia and nitrite, so I would rule out that as an issue.
Good job with that.
What were the symptoms that made you suspect cotton mouth?
Do you have a picture of a fish that is currently expressing symptoms?
What is the time-period of introduction of fish to death?


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post #6 of 8 (permalink) Old 07-23-2018, 08:39 PM
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I effin hate tetras. Die every time. Try a more Hardy fish.

Tank's too hot? Your cories are gasping... and Make sure your cories have an air stone.

It's a process, and there's never a finish line. try again! You certainly have patience, a fishless cycle. Way to go!

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post #7 of 8 (permalink) Old 07-23-2018, 08:46 PM
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My Buenos Aires and Colombian Tetras are doing fine..
Serpias did fine for a year till Columnaris wiped them out..
Believe one was actually a carrier but non-lethal for a long time..
Should have culled it to begin with..

Neons.. err no..

"A man with a watch knows what time it is. A man with two watches is never sure."
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post #8 of 8 (permalink) Old 07-23-2018, 08:47 PM
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I feel exactly the opposite about tetras except maybe neons...
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