Hi all,

Recently I noticed that one of my harlequins was acting strange. I have 8 in a planted 45 gal together with 6 congos, 2 dwarf rainbows, 5 corys, some amano shrimp, and 1 flash pleco. He is swimming near the top of the water and does not stray very far off from plant cover. He also has very fast breathing and some of his fins are torn. I cannot see any white spots or biofilm of any sort so I am ruling out fungal infections. He no longer schools with the other 7 who are eating well and acting normally and otherwise show no signs of illness.

None of the other fish show any aggression towards him so I do not know why his fins are torn.

Parameters:

Ammonia: 0
Nitrite: 0
Nitrate: <50ppm
pH: 6.5

Please help!