:helpsmilie: I have a 10 gal. tank with 1 betta, 5 split tail guppys, 5 fancy tail guppys, 1 african dwarf frog, and 3 peppered cory cats. First let me state MY BETTA IS NOT A PROBLEM HERE!!!!! He loves his tank mates and leaves them all alone. He is very easy going, happy, and couldn't possibly care any less who is in the tank with him. It has been this way for about three weeks now (which is how long I have had said Betta). The question I have is I have 5 guppy's that have nipped fins (3 fancy and 2 split tail). I identified the culprit (a fancy guppy) and have removed said bully from the tank.....anyone want him? Any who...I was wondering if I could use vita-chem with out harming my other fish. Or do I need to quarantine these five fish and treat them and then add them back into the tank once their fins grow back? And about how long will it take for their fins to grow back? None of them appear to have body damage just fin damage so I am pretty certain they will grow back. I am doing weekly 10% water changes...thinking about moving it up to twice a week. I have read that this will sometimes help in the fin regrowth? Yes? I am don't know what my readings are I have just been taking my water into Petsmart and having them test it for me. Which they say all is good. I think that is about all you might need to help answer this question. I filled out the aquarium info so you can look there also. Thank you in advance for the help. Long question short. Can I use vita-chem in my tank with out harming my fish that don't have nipped fins? Or is there a better medicine that I could use to do this? Or should I just not treat at all?