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Clowns hanging at top of tank

Posted: Tue Apr 20, 2021 6:24 am
by Andreas
I have a 400 litre tank, excellent water quality with 10 clown loaches and 5 Pakistani loaches. They are all fairly small, less than 2 inches.
One of my clowns has been floating at the top of the tank in a straight up and down position for 4 days now and another has just started to do the same.
Their colour is really great and zero white spot but I noticed a bit of fin rot on the tail section.
Can you please help me diagnose and treat.
Many thanks in advance.