1. Definitely have it in his water. Enough to at least keep it moist
2. 30 mins should be just fine without heat or flow.
3. Dosn't really matter if the sand goes in first or last. I personally like to do the sand first. But many people like to do it second.
Just bring a decent sized rubbermaid, fill it wil some tank water, put the rock in, and getter dun
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