Any helpful suggestions would be much appreciated. My tank is 2yrs old. Running LED's. Placed center of tank on a nice rock. Indirect flow very gentle. Mantel moves a tiny bit.
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Nice clam!
Went over it with a magnifying glass-lol. Seems very content in that spot. Not sure if it's attached or not as I don't want to bother it.
Maybe the rock it's on is preventing it from opening anymore?
I thought maybe it was in a divot or something, is all. I was just theorizing.How so? The rock is pretty much flat.

