I have a texas x synspilum and a convict that is sick. And now it looks like my parrot is too. They are staying at the bottom of the tank and the base of there finns are red and inflamed. i took my water to be tested and there where a few problems. the ph was too low and amonia was a bit high but i have fixed that now. what should I do to help the fish? how an i cure these fish? thanks