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What ru running? These guys don't require a ton of light. If you can keep zoas then your fine.
My tank is 100% softie and is mostly T5'S that provide the lighting.
No pressure though
Do the shadow test on the clam. With the lights on, wave your hand over the light to cause a shadow over the clam. If hes in good health, he should react by shutting right away.....or atleast partly closing.
Try target feeding him with some reef chili or something to see if he takes it.
This thing is massive, and has gotten too big for my tank so I need to re-house this thing. Bring a bucket as it's too large to fit in a standard bag. Perfect for a center piece coral.
It's about 8"W and maybe close to 6" Tall. Wi take it out for a better pic for those that are interested...