Black marks on Tetra tail fin !!

swackett

Member
Joined
29 May 2008
Messages
439
Location
Epsom, Surrey
Hi,

I've noticed a few of our lemon tetra's have these grey/black marks growing on the base of their tail fins. We tried dosing with an anti-Internal bacteria product that seems to have made no difference. The effected fish are still swimming around and eating, however their colouring is now a little dull compared to their tank mates.

Could it be old age? Some of them we have had for 18months now (now sure how long Lemon Tetra's live for).

Does anyone know what it could be or how to treat it.

tetra2.jpg
 

beeky

Member
Joined
21 Aug 2007
Messages
879
Location
Chippenham, Wiltshire
I don't know what the black marks are. Are they flicking at all?

I've had lemon tetras for 4 or 5 years so I don't think it's old age.
 

swackett

Member
Joined
29 May 2008
Messages
439
Location
Epsom, Surrey
No I have not seen any flicking, they seem to be behaving normally - Still going mad when they get fed!

Its seems to be growing on them, if you look down on the fish you can see the area is slightly fatter.
 
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