I ran out of sponge because it is winter here. The water is about 40 degrees (or less) and the sponge disappears in the winter.
I collected about a pound last year and I didn't think the Idol would eat so much. This summer I will collect a lot more.
It is probably all over New York harbor but there is no place around the Harbor where you would be allowed to collect or even walk around on the rocks. They would take you as a terrorist and probably shoot you.
I collect it in the Long Island Sound, since the Sound is 150 miles long, there is a lot of places to collect.
I feed all my fish with that device and would not think of just dumping food in the tank. The Idol still gets one meal from the dish, which is all covered in coraline algae (but he doesen't mind).
I give the Idol clams, mysis, plankton, fish, nori etc, the other fish get the same except for the blue pipefish which get live baby brine. The gorgonians get a mixture of Selcon and finely chopped up clam and other things.
It will be spring in a week or two and I will start collecting. I went out to Montauk yesterday (the east end of the Island) but there was nothing to collect. I wanted some seaweed.
Have a great day.
Paul