I've been reading about RDSB and was curious if I have to use a smaller grain sand? Some articles mentioned using oolite in a 5 gal bucket. Just got some larger grain Aragonite sand that I was going to put in my BB 155 gal tank but I would much rather give a RDSB a try first. I can return the Aragonite and get a couple bags of oolite if that would be better? Thanks all

