It affects neon tetra, guppy and betta.
Symptoms I've seen are first the fish becomes blind and has hard time breathing.. then over the course of 2-3 hours he loses his swim bladder control(to the stage he flips belly up) after a while then sink and dies.
The whole ordeal is about 4-5 hours from first symptom..
(It's not water parameter related, no bloat, no dropsy, nothing on the body)
So far in the last 36 hours, 3 neon tetra, 2 guppy and my beloved Fang died..
(whatever it is Malachite green and aquarium salt didn't help.. The aq just shocks the fish and he dies on the spot(I tried in the early stages on fang..)
(the guppy are currently in malachite green(1 died last night few hours after I put them there) and the neon tetra in the original Aquarium, 2 died while I was sleeping)