I have some DIY "live rock" left over. I never cured it fully so it will have to be soaked first. The stuff I had in my tank was amazing. It is also the best sump media going in my opinion, beyond porous. Just google Oyster Shell Live rock and see for yourself. I am also giving away the remainder of the crushed oyster shells that I have (2/3 of a 5kg bag). I made the rock with pure white Portland cement.
Come and get it.
call or text me: 403-614-0990
Located in Airdrie