hi i have 20 gallon tank 24 inches in length with 25 pounds of live rock , wanted to get some corals which corals could i keep with 65 watts . it has 2 bulbs 1 daylight and one actinic bulb? also were is the best place to place the corals at the top near the lighting or at the bottom of the tank further from the lighting. also can i keep zoas and mushrooms?