I'm very new at having fish and just noticed one of my fish has a red spot on it's back. Picture link is below. I don't even know what kind of fish it is! Can someone tell me, and let me know if you think the red spot is something to worry about, what it might be, etc?
Thanks so much...
I have a 5 gal Qtank, which contains copper
it had been housing a blue-green chromis for about 3 days, that got taken out of the main tank because his fins were in really bad shape
i took the chromis out and put him in the main tank
i let the the Qtank sit for 2 days with no filter or...