I need help asap. So I bought a new fish that I put in quarantine when I noticed he had fin rot and was refusing to eat. A few days later I noticed a white string coming out from where the fish usually poops.
About few days later, I notice my other fish suddenly has the same thing, but he is acting healthy, eating like a pig, and pretty much behaving like nothing is wrong.
Are these internal parasites and HOW do I get rid of them asap? How long can the fish have them without major harmful affects? What SPECIFIC medications can I buy that will work on a 1 gallon tank?
Currently I clean the older fish's water weekly and am giving him aquarium salts. Is this okay?
I need HELP. I do not want to lose my older fish. He's just barely a year now and has been completely fine until this point. Please help.