MY jaguar cichlid has HITH. I am feeding the best stuff out there (mix including New Life Spectrum, Hikari, Tetra, and HBH), stopped using carbon in the filter, do 75% weekly water changes, and he never gets live food. He is over filtered and the only thing I think I have left to include in his treatment is metronidazole. I was wondering if this was avialable over the counter, or what form I should get if I need to get a prescription (my dog's vet will prescribe things like that if I know exactly what I need). I also need dosing and treatment directions. He is in a 75 gallon. Thanks in advance.