I run a big net bag of Hydroton balls in my sump, supposed to take the place of LR I'm told because it's very porous. Seems to work well.
Hey Jorian I have a 1/2 a sack of the stuff if you need some.
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Hey! I never "LEFT" the hobby, just doing fresh water now. Which is still listed as part of Canreef if I'm not mistaken. 
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