Clams and sponges encrusted in Live rock?

[ctniners]

Hi,
I went to the LFS this past weekend and bought some very colorful live rock with some sponges....to my surprise 2 days later I found that there are at least 2 encrusted clams of some type that open and close every once in a while...my question is, I am suppose to target feed them? How about the 3" tube sponge? or do they just live off the nutrients in the water?

Thank you for your help

 

[a4twenty]

should be fine with tank water, if you wanted to feed them add a little phytoplankton to the water.