I just throw them in frozen in one tank, the other one I thaw it out first before feeding. In the other tank, they finish it within one minute. I thaw out in one of the tank cause the Naso is a picky feeder and once it's thaw out, I just toss it in, in small chunks. I usually cut all the frozen food in small chunks, depending how much they eat then put them in small containers back into the freezer, that way I just thaw out what I need to feed each time. :happyfish