I have added three new fish(clown loaches) to my aquarium that had a tetra and the loaches have all died and now the tetra seems to ne losing scales. I see scales floating in the water. Any ideas??
Im not sure about the loaches but scale loss can be caused by injury: fighting with other fish, sharp rocks.
Are there any little white grains on his current scales. If so that's "Ich" get some medicine i guess.