Just do some "tank watching" and I'm sure you will find the reason. said:I've been watching it happen for 2 + months. Those snails where the first identifiable possible culprits. I watched it progress from a frag, to the frag nearest it, to the established small colony on the rock all three were sitting on or attached to. To the nearest colony on another and to a final colony farther away but still on the rockwork.
Only the frags in the sand, off of my rockwork have yet to be attacked.]