pretty new to SW
tanks. i've have had one set up for about 3 months now. 75 gal fowlr
. planning on switching from cc
to sand bed (for the look and bio filtration)but not sure of the best way to do it. i want to convert to a reef tank as well. i'm getting a ro
unit soon. should i take everything out or just the rock and cc
? how do i get the new filtered water in without losing all the cycled water? any advice would be greatly appreciated.