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My tetras mouth looks like its been picked out and it looks like it skin is like coming off. I'm sorry, its hard to explain and hope the pic shows well
Idk but id take him out of the tank if other fish are in there, put him in a quarintine tank, as it could be bacterial, and spread..bettr safe than sorry
Bad water conditions, bad fish stock (is the fish new, from fish store, take em back if so) that's about it really, those two factors can ruine your tank overnight
High Nitrates will cause your fish to become stressed. In turn lowering the fishes immune system effectiveness responding to bacteria or fungus. Many fish illnesses live in the aquarium all the time, but the fishes immune system can handle them when it is healthy.
do lots of PWC to get your Nitrates down and slowly increase the temp of your tank. The increased temp will make the bacteria's etc life cycle speed up. Adding salt may help as well as it will prevent some types of bacteria etc from hydrating it's self properly and will die of "thurst".
Most effective thing is the PWC as good water fixes lots of things and is the best preventative maintenance.
Yeah I did a water change yesterday And was gonna do one this morning but something...unexpected happen. I'll do a filter maintenance too, my aqueon is way overdue but until then it'll have to wait I'm afraid:/
He said he's using test strips and has a liquid kit on the way and last time he measured his nitrates were at 40 and he says his other fish are completely healthy
If it is fluffy and cotton-like it could be columnaris. If it is thread-like it could be a fungus. Either way I would try to QT and treat with kanacyn first. Then maracyn and maracyn II, if the kanacyn doesn't help. They will cover gram +/- bacterial infections.