thks AP, but mine is not a full sps tank....... still hv some lps, softies and ricordea floridas here and there. juz hoping that the tank can survive my japan trip. but i gotta admit it is quite hard maintaining a mixed reef tank. e.g. i had a pcs of acro colony dropping on to 2 pcs of my rics 2 days ago. guess what, my acro survived but my rics melted. u know how highly rics are being sought after today. but i'll make them propagated in no time.