Crocea clam

[Delphinus]

I find with new clams I have to put them into a spot with a real depression in the rock that they can fit into. They do like to wiggle around a bit and in the flow can get knocked over or pushed over by snails, urchins, etc. I find even making a little fence of rubble isn't usually good enough (maybe if the rubble was epoxied so that it can provide some resistance to the knock-down). But the right indentation in the rock and suddenly after a couple days they're stuck like superglue. And of course orientation is important - an angle probably isn't good either, they like to be flat to spread out to embrace the light.