Seems that a neon wrasse would be okay for your tank. they are peaceful with other fish and don't require a lot of space, just some rocks to swim around. They also do like to feed on worms ( like the six line) but do not require a mature tank full of them to live.
http://www.saltwaterfish.com/Neon-Wrasse_p_303.html
I'm not sure about the clams, however someone here will make a sudgestion im sure. Tank looks good already. Keep up the good work and welcome to the best hobby ever.
d(''d)