hello, i have made the change to a dsb from c.c. in my switch to a 150 gallon tank. i also have a 50 gallon refugium. my circulation consist of a mag drive 24, a fluval fx5 and a rio 2100 power head. the sand in the main tank is about 3-4 inches and about the same in my refugium. the main tank has about 75 lbs of live rock and about the same of base rock. lighting is an older hamilton system using (4) 60 inch vho flourscents @ 110 watts ea. lights areonly about 2 months old. on the refugium i am using a 24 inch basic flourscent and i know i will probably need to change this at a later date. my rock has started some coraline growth but i noticed yeserday that the rock is turning a golden light brown and a little darker in some areas as well as a small brown area on the sand. it is not the slimy reddish brown and does not simply rub off. the strange thing is in the refugium the sand and the couple pieces of live rock look good. sorry for being long winded and any help here will be appreciated. thanks in advance.
