eco bio blocks

[Lampshade]

Hmmm, interesting concept though. If I could find macro rocks in square building block shape I'd be in for that. Much easier to use as base rock.

[syncro]

I suspect they will be similar to dry rock + bacteria additive (e.g. microbacter). Until someone tries them in a reef aquarium nobody can know for sure. Go for it and let us know your results.