Guppy keeps scratching against gravel..help!
Hi, this is my first post. I have 4 guppies and other fish in my 20 gallon tank, but only one guppy is scratching itself against the gravel and seems to be opening and closing it's mouth more than the others. I've been making 20% water changes, left the filter media out and keeping the tank clean. Been also using a half dose of quick cure for the past 4 days because I have a pleco in there. I've been also using melafix at the same time, is that safe?, what can I do from here? He swims fine and eats normally but hides at night, just the scratching that has me worried. Should I move him into my 2 gallon hospital tank? If I do, is it a good idea to fill it with the water from my 20 gallon tank just to be sure it's safe(hospital tank has been running with new water and a bio wheel filter for a week with no fish). It's obvious I don't want my guppy to die or for the other fish to catch anything by stressing them with medication. Thanks for any advice..