Normal reef conditions should be right.
What tank are they going in?
The best kinds are the kind that will come in on live rock. I found a nice little piece in one of the invert tanks at one LFS
that had five different types of sponges on it (encrusting: pink, yellow, blue, purple, and black). These types of sponges should do well on normal reef tank filter feeding. The fancier ones that you would buy individually will simply require so much feeding that they will likely starve or your tank will become an algae farm.