im not supporting a bare bottom tank. I think they look terrible but every surface in the tank will have the good bacteria including the glass, sides and bottom... the sand may have more but its nothing thats gonna make or break a tank.
I know of many many tanks with great flow and sugar sized sand with no problems. If your worried about it go with crushed coral and manually agitate it once a week
I know of many many tanks with great flow and sugar sized sand with no problems. If your worried about it go with crushed coral and manually agitate it once a week