I've had my tank set up for about 3 years and I still am having a brownish algae taking over my tank I've got a fluval fx5 ,remora pro skimmer, 125 lbs live rock which all the brown algae is growing. I introduced purple coraline about 2 years ago and I used to use tap water but a month ago I switched to ro
water I do weekly water changes have about 30 Mexican algae eating crabs and 10 fish.. I also changed my bulbs about a month ago what's going on? Its not going away??? Nitrates are about 0 please help me!?