Thanks Ben,
The 'System' means the package including the tank, UGF, 2 power heads, and the gravel...
And I will add more live rock for sure.
Thanks again
I have a FOWLR (and some mushroom) for 3 years already, currently I have crushed coral as subrate and would like to switch to sand. (When I first brought the system, my LFS mark the system for salt water :x ). I intended to switch it into a reef tank. Any suggestion I can do it saft and not...