Aragonite is my favorite. I have fine sand in my 10 gallon and it mounds up. I have aragonite in my 20 gallon and love it. I've also had crushed coral and I wasn't really a fan.
I like nasty wet live rock, but like you said you could get pests. So in your case, live sand and dry rock would make a good combo.
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Get a life!
Current Tank Info: 20gL mixed reef, 10g mixed reef w/nem & clown, 5g NPS & harlequin
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