The clam is a definite stretch....don't think I would go there.
If you're aiming for 'easy' corals, consider holding off on a clam until you get the rest of your corals growing effectively.
Also, the actinic bulbs in your fixture don't count much towards your watts/gallon or PAR number unless you're running an ATI Blue plus. I'd suggest getting your hands on a PAR meter and see how much light gets to where you plan to keep the clam.
Lol, gotta love T5 smashing kittens.