Have a 2 x 5 inches of yellow finger sponge growing in my tank, which I can cut for you here in Forest hills, 11375, no way it'll make the mail to you in this heat, after which you might as well go with the frozen food. I recommend the post regarding clams. Get a few of many types to see what he goes for. mussels, clams, the little ones, the big ones... If you're by a marina out there, go pull up a bucket full of inverts growing on the sides of the docks, There are plenty of orange/yellow sponges encrusted onto the mussels, along with plenty of tunicates, copepods. You need a dock that is always floating in the water, not the fixed non-moving docks. I usually go to Point Look out, or Oak Island, drive in, grab a bucket full, drive out within 5 minutes.