I have had some issues with this tank... Lots of algae for no apparent reason, Nitrates are at 2ppm, Nitrites are at 0, Ammonia is at 0, I think it is that I have no skimmer, or that i dont use RO/DI water, It is a 55g with an amiracle wet/dry, and the stock is pretty low, I have 1 yellow tang, 2 clowns, and 2 damsels. no other invertabrates or CUC, as the person who had the tank before me used copper meds.