Fuge Substrate

[Texreefer]

Crushed coral is only good for making Aragocrete.

if your going to put sand in your fuge then you need to small stuff.. The larger stuff is a detritus trap and will not provide you with an anerobic area for denitrification.

I do, however, like to mix in a few handfulls with my display sand as it creates texture and will grow coralline easily . when the flow patterns in your tank get established, over time this crushed coral helps to create an intersting landscape