I'm having a problem with my fish this week I've had 4 harlequin rasbora and 1 keyhole cichlid die(the keyhole never really ate), the other keyhole has a white/gray patch in it's side and some of the rest of the harlequins have fluffy white stuff on the fins.
The harlequins are in a salt bath now (2tsp in 3L), one is swimming upside down and I'm treating the tank with pimafix.
Ammonia is <0.25ppm,
Nitrite is about 0.5ppm
Nitrate is between 0 and 5ppm
pH is 6.8
I've done 15-20% water changes and spent all my money on the test kit and pimafix, is there any advice you can give?
I have another tank with 9 or 10 young swordtails that I could transfer some fish into.