Do you buy the food frozen and then thaw it out to make your cubes?I always though variety is the key to feeding all fish. I feed my fish a little of everything, at least I thought I did until I read this article. Tuna out of a can is new to me and also black worms. I have a small 40 gal reef so i have to really watch how much i feed. So i make my own frozen cubes. Each cube is made of 4 different foods, from mysis shrimp, red worms, omnivore delight, brine shrimp, silverside. I also feed pellets when I just want to mix it up. Each cube of food is 1ml. And I know I'm not feeding enough at any one time. The reason I do so, is so the fish on my reef do there jobs and forage. Every fish has a role and I learned if I over feed they refuge to play that role, not only that in a small system as a 40gal overfeeding can lead to several problems really fast.