X2 on the matrix. I used it in my canister filter for 6 months prior to the sump upgrade. And my no3 never went outside of 8-11ppm
I am actually considering making some some sort of DIY layered rack to put in my socks compartment and stop running socks completely.
I am actually considering making some some sort of DIY layered rack to put in my socks compartment and stop running socks completely.