I have kept saltwater fish for a while, but would like to try my hand at a reef. I was thinking a small setup like a ten gallon. With a little live rock, some easy beginner corals, and a pair of clownfish, and some snails and crabs. I want to start out small to get the hang of it. Then maybe turn my larger tanks into reefs. For filtration I was thinking about letting the live rock take care of some of it, and also a 3 stage bio wheel filter. I didn't think I would need a skimmer for that size of tank. I will do four gallon water changes every week. Is that to often? Also for the lights, what kind of light should I use since it is not very large or deep? What type of light will I need for soft corals? How much will the light cost? Also I will add some powerheads to circulate the water. Will this be okay?