May paramaters are good and im dosing coppersafe. Its a 20gal tank with a HOB filter and a power head with a sponge filter. I have a yellow tang bout 4in or so. Hes doing great and no concerns with him. Its bare bottom bc ita a QT tank with pvc and pota as caves. Im having a horrible algea outbreak. No carbon running as idk if i cam or not with fritz coppersafe. Is the tang gonna freak if i cut the lights for a few days or will he be fine? I can brush algea off but with no carbon or anythimg whats going to "suck it up"?