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#1
11-19-2008, 05:51 AM
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i've heard of people using type2 and gu (portland) but type 10hydro is the hydraulic and its needs the antihydro additive mixed into it.
Any experiences you've had with any type would be appreciated,I suspect because its underwater maybe the buildup wont occur?but might raise salinity slightlly as the minerals leech from the cement,maybe im thinking too much into this.... 
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#2
11-19-2008, 01:01 PM
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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.
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but what the heck do i know
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#3
11-19-2008, 02:22 PM
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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
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