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That clam is Tridacna deresa. I have a few Tridacna, but not that specie. A source for info on Tridacna is Daniel Knopp's book "Giant Clams". Knopp also has written some on-line articles. Deresa's can get quite large and have a reputation as being one of the easier clams to keep.
Two comments. First, IMO, the clam should be moved out of the anemone's reach. IME, anemones can burn a clam's mantle. Corals - or the corals in my tank - for some reason don't seem to effect them. 2nd, if this animal has recently been placed in the tank, give some attention to the mantle appearence, especially if it starts to bubble or turn blotchy white. These animals - especially adults - take a while to adapt to different lighting conditions.
IME, given stable conditions in an established tank, giant clams are fairly easy to keep. They need enough light, and IMO more light than most corals. They can benefit from the addition of live or inerted phytoplankton to the tank, but for many tanks (and clams) this doesn't seem to be a requirement. I'd read Knopp's book if you want to understand the animal and it's requirements.
It was my experience with M. doorensis that it could burn clams. Other potent stinging inverts, like Favids, don't seem to. Nematocysts can be specific and maybe an LTA has nematocysts specific to molluscs and a BTA doesn't, I don't know.