Sick red-tailed black shark

[biggles]

Hi guys

My above fish (the last of five I bought at the same time) has developed a sore (as did the other four before they died), it's position (on all of them) is just below the dorsal fin on the left flank. It started as a tiny white spot and just keeps getting bigger. The fish otherwise seems healthy enough it eats well and is lively enough. Does anybody know what it may be or any treatment that may help. The fish is currently isolated from the rest of my stock and none of the other fish it (they) shared a tank with are affected.

[barmby]

It might be a little late now.... What is the outcome?

[biggles]

Unfortunatly it finally died about a week ago. Notghing I did seem to help it.

[barmby]

It might be just a case where the batch of fishes are sick with something. is the tank ok ?

[biggles]

The other fish that were in the tank are all fine and the tank has now been de-commissioned and disinfected. I will use it as a planted tank in future when its re-commissioned with maybe some tetras, rummy noses or some shrimps in it at a later date