I have a blue lobster, some 4 inches in length (not counting antennae), living with several neon tetras and 4 community fish. I feed the fish, goldfish flakes twice a week. The lobster goes hog wild when he sees all the flakes floating in the water. I also make sure on those occasions that he gets several shrimp pellets, which he loves even more.

Assuming a twice a week feeding, how much food should he be getting?

And is twice a week enough?