question for diy rock makers

[i have crabs]

ive always read that the issue with cement rocks was thay affect ph quite a bit for the first few months i think garf.org has a bunch of info also i think talkingreef.com did a show or 2 about it.

[argan]

i've used regular type 2 in all my rocks and as long as i freshwater cured them, haven't had any deposits or salinity problems. Lots of coralline growth on them now tho if that counts as a deposit :P