Hi, my name is matt and im new to the hobby. Ive been running my 20 gallon tank for about 3 months and have one red perculer clown, 14kg of live rock, 2 powerheads 1200, aqua medic bioflotor skimmer,8 hermit crabs (red legs and micro blues), several snails and one piece of coral (cant remember name). My lighting is 1 x 420 actinic and 1 x 10,000 k flourescent. i am hoping to build up my coral stocks and am wondering which corals would be suitable for my tank??? also some sort of greenery i.e seaweed. does anyone have any suggestions of what type of things i can keep?