Right had more deaths yet again today
Three I have found dead. Water temps were up a little (28 degrees)so have tweeked the heater. Water tests all ok, slightly raised ammonia. Filter ok, air pump ok. Whats going on?
One fish which TwoDogs and Alistu saw had shredded fins which indicated bullying. He's gone now, had to put him out of his misery.
One neon tetra only has half a tail fin. Could it be fin rot? If so what are the signs?
Have no idea what else to do now.

How high is your ammonia?
Ammonia in tiny amounts is lethal.

What fish do you have in the tank?

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My Reps2.6.3 Leos1.1.0 Bearded Dragons0.2.0 AFT's

what were the fish that died? How long has the tank been up and running?

Mason

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A guppy, a neon and a scissortail fish died.
Tank up and running for over a year now.
Have a siamese fighter fish, columbian red fin tetras,
neons, a plec, corydoras catfish, arasborais/scissor-tail.

ammonia was 0.25
the only other thing was a really high pH.

How many of the colombian tetra's do you have in the tank?

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Trip Tales Blog

four of those

The high ph could be killing your fish... but if the fins are shredded in a relatively short space of time i.e. overnight, it is usually bullying. The colombians are the only ones on your list that sound like they could be the culprits. I've read that they can get a bit aggro if kept in smaller quantities. Maybe if you got 4 more it might help, but get the ph sorted first - there is a product called Ph Down that you can use, but don't raise the ph too quickly.

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Trip Tales Blog

What is it now? It is more likely to be ammonia killing them than PH.

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My Reps2.6.3 Leos1.1.0 Bearded Dragons0.2.0 AFT's

Not if the tank has a high Ph I've found with my tropical tank at ph of 7.5 isn't as bad as acidic one of 6 my goldfish inhabitant, Nitrite is the one to watch for in more alkaline waters, what's the ph?

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"Revenge is scared into my soul. Agonizing for its arrival our
wishes become our relief---Sleep where you are equable"
genesis- from 'loveles

Also stress can play a big factor in the health of fish if fish are stressed I've found even small changes to water can be lethal for them.

__________________
"Revenge is scared into my soul. Agonizing for its arrival our
wishes become our relief---Sleep where you are equable"
genesis- from 'loveles