Just discovered this guy on a coral that is almost 2 years old

[Koty]

Just discovered this guy on a coral that is almost two years old in my DT. Any idea what to feed it if at all?

?

 

[Timfish]

It's a filter feeder and looks like it's doing well without having to be fed. I have similar clams in some of my tanks that are well over a decade old and doing well without being directly fed anything.