Hi, My 7 1/2 yr. old acf is still having swimming issues. (swims on his side, going around in circles at times, not staying upright at times.) And he still has a bulge on his left side. I thought it might be an internal bacterial infection and went to buy some Maracyn 2. The pet store doesn't have that any more and told me to use API T.C. Tetracycline. Now I am afraid to use it cause I don't want to kill my frog. Would it be safe to use this on him? I don't have access to a vet with acf knowledge so I am hoping someone out there can give me some advise. Thanks.