Hi, I have a 175L corner bow front with 1.5 inch sand bed and 21kg of live rock, no sump just a canister filter, tanks been running about 8 months and no major problems as of yet. i have 2 clowns about a inch and a half big, a fire fish about an inch and a wrasse about 2 inch, if I add more live rock will that raise my bio load? Can I add 2 more fish? This is a nano tank so it's not like I'm thinking of adding any Tangs or angel fish. Any I ideas on what I could add? Maybe some thing that would eat hair algae or some thing that would turn the sand over. Cheers