Obviously I just put it in the tank but the guy at the store didn't know what it was. I think it's a Tridacna squamosa, but that's just my guess, which is why I put it on the sand. Any thoughts
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That looks like a tridacna maxima. You should slowly move it up in the tank. For now you can place it on a seperate piece of rock so it can attach to it and make moving it easier. I don't think it will get sufficient light on the bottom in a deep tank.it opened a little more today. I'm thinking maxima like you guys. But still not positive.