yes i do have fish in it i have 3 damsels they have been in it for about 5-6 weeks already i have the current filltration system a magnum 350 canister filter hob thats rated for 60 gallons and a 55gl sump/refugium fith a protien skimmer thats rated for 125gl my tank is currently 60gl i also have some live rock not much about six lbs i havent put more fish cuz i am saving for some t5 lightsk.tran;4487892; said:thats diatoms. do regular water changes 10% daily until it goes away. its there due to excess nutrients. do you have any fish? corals yet?