I added a mushroom and leather coral in my unheated one gallon jar lit by a 6500K freshwater light about two weeks ago, and both seem to be doing fine. The mushroom is always fully open in the day, while the leather is a bit more temperamental but does have some of its polyps extended much of time. I am headed to my freshwater LFS soon, and I wanted to get some frozen food for my tropical fish. I am just wondering what would be a good pick that I could also feed corals with. They currently have in stock brine shrimp, cyclops, rotifers, krill, and "microplankton". Any suggestions?