Bacteria infection? No! Parasite Infestation..Yes..
Have you added new fish the last little while, and this started happening. You said its been going on for a few months..
Or it could be your water conditions before that maybe were not right at that time.
I have heard that some frozen foods can carry problems..
do you rotate these foods enough..like 1 pea every week and 1/2,pellets once a week..
secondly you must medicate the WHOLE tank not just the fish..this is why you have had no luck..Maracyn and Maracyn 2 are great products to use
get back to me..
40gal 2 electric blues, 1 male convict, juv.electric,pleco
10gal 6 lemon tetras, dwarf loach,tiger barb(rescued)
33gal 2 clown loaches..
4 fancy goldfish,baby spotted pleco 10gal female Electric blue and about 25 fry