is there any chance that the new group of altifons were wild caught?
When new fish die so soon & nothing else even shows stress, the new fish's history should be a consideration.
If not wc, perhaps delicately raised in very pampered water, unlike treated tap.
&/or exposed to illness, stress transitioning between the breeder, store, and then into your tank.
When new fish die so soon & nothing else even shows stress, the new fish's history should be a consideration.
If not wc, perhaps delicately raised in very pampered water, unlike treated tap.
&/or exposed to illness, stress transitioning between the breeder, store, and then into your tank.