i just set up my 5" dsd 30 gal refugium(SD) sand 2 weeks ago, i have 4 (Had hair algee on them)pieces of LR out of my main tank, and a 9 for 99 kit from IPSF. I have hair algee growing and diatoms, are quickly covering the the top of my sand bed, the Black snails(from IPSF dont rem the name ) wont stay in the refugium, found one 4' from the ref. and a couple layin around it( still alive) but i am wondering if this is normal, and if i need to add anything else to the refugium..(to get rid of the diatoms) i have some grape culpera and some red tang heaven, in there also.