tlok
New Member
My tank is 90gal with approx 4-5in live sand bed, plenty of live rock and fish that are thriving. I have both actinic and a large metal halide for lighting. I am consistant on my water changes (10% weekly). The problem is I can't seem to keep any corals. I was thinking of investing in an ro-di unit as I do not currently use one. Is this a good idea, or should I be addressing another need first to solve this problem????