I'm also going the marco dry rock this time. Waiting for the pallet now. I plan on soaking and testing. Hoping for no leeching. Looking forward to aquascaping.
If Marco rock is like mine witch I believe it’s mined from the same farm you’ll have nothing on it so there should be no leeching . Good luck! I did scrub mine with a wire brush and washed it real good. Lots of dust came off