Hi all!
Ive got some mysterious deaths going on and my LFS cant help, so i thought id ask you all for your wisdom. Ive had a couple of deaths where the fish was fine before (feeding swimming about) then got very weak, the gills swelled up and went very red and 20 mins to half an hour later it was dead. So far ive lost a cherry barb, zebra danio and a couple of tetras.
Water tests all seem fine- pritty much 0. have tested it myself and got my LFS to do it. Also in dechlorinating like i always do.
Any ideas would be great!
Ive got some mysterious deaths going on and my LFS cant help, so i thought id ask you all for your wisdom. Ive had a couple of deaths where the fish was fine before (feeding swimming about) then got very weak, the gills swelled up and went very red and 20 mins to half an hour later it was dead. So far ive lost a cherry barb, zebra danio and a couple of tetras.

Water tests all seem fine- pritty much 0. have tested it myself and got my LFS to do it. Also in dechlorinating like i always do.
Any ideas would be great!