01-20-2009, 11:50 AM
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if there was a 5-minute set time, they were probably using some sort of epoxy. Most types of concrete take several weeks to fully cure (it'll be "hard" long before that, but not completely cured for several weeks). I know if you use Quickrete Quickwall, it cures in a week or two (but, it is full of small little fibers that might not be desireable for a saltwater tank).
In fact, many kinds of concrete will also affect the pH of water. However since you'd only be using a small amount to fill in drilled holes around coathangers, then it might not be enough to actually have an impact.
Kells, any reason why you proposed using concrete as opposed to some kind of aquarium-safe epoxy? Besides, assuming you'll be doing some of this on your existing liverock, you'll want to leave it underwater while you work with it, or at least only out of water for a short period of time. With concrete, that might not be possible... some things to think about anyways.