Have always used Aquascape Milliput Epoxy (from J&L). Just heat in the microwave for 5 sec and mix. Be sure it the epoxy is well mixed and kneaded. Then apply to your frag plug and stick on a rock. Or put the stem of the frag in a hole in the rock, and paste in a small piece of epoxy around it. Pretty easy, actually.
And yes, underwater.
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