Aefw how to kill them

Ok, so here is the problem. I got a nice ???? Acropora. Don't know the name. Butt I discovered that one of the symbiose crabs is a across eating one. Hairy as hell, white eyes.... looking at the acro I see a lot of "bites" like that from the aefw. But no flatworm, no eggs...

So my first question is:

Do acro eating crabs give an acro the same bite marks ore is this truly the most saddest acro in the world because it is attacked by a crab as well as the aefw.

Second if it's the snails. How to I kill them. I live in Holland. For the people that do not know where that is,,, one word.... Amsterdam
 
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