oh well, in my opinion, some corals like mushrooms are so easy to keep that if you are considering an FLOWR tank, you might also consider keeping them as they can live in pretty dismal water conditions compared to other corals. If you have too strong a flow, you will have issues keeping mushrooms. If you have the money, you may just want to spend the extra thirty bucks and get the wavemaker. By the way, a 2 foot tank would not be able to house too many fishes. Tangs and triggers are out as they require a much larger swimming space, clowns are agressive towards each other and damsels - i don't suggest you get them. they are aggressive and hard to catch when you eventually want them out of the tank. You may want to consider a mushroom garden....underwater. leather corals are also pretty easy...then as your confidence grows, you can try green star polyp, zoos, open brains and even clams. those are what i have.