I am still new at this. However my 12 cichlids in my 55gal. seem so healthy I dont want to change that. I keep the glass cleaned on the inside with the magnet thing and wand and the water stays crystil clear (got pretty good filters). But my rock decor is getting covered in green algae. At this point it actually looks good. But is it bad for the fish? I dont want to put any chemicals in there! All the algae eating fish creep me out! At what point should I take out rocks and clean them? Is the algae hurting the fish?