its a fairly small tank so id say stick to hardier corals such as mushrooms and polyps. you can get a really nice looking tank if you build the rock structure right and cover the rock work with bright zooanthids and mushrooms. you may be able to get away with a leather but the lighting may just not be enough, try a frag of a leather and see how it fares before spending cash on a large peice. also take a look into non-photosynthetic corals they will do great next to a ledge providing shade or right in a cave, dendrophyllias are very attractive so are schleronepthias and chili corals are drak red in color which adds good contrast, also if you think you have the patience, try tubatrea (sun coral) these usually only open in dimmer conditions or at night, the only flaw to these beautiful corals is that each head need s to be fed so if you buy this alos grab a coral feeding tube and some spirliana brine shrimp or small mysis shrimp as it should be fed at least once per week. if you upgrade the lighting youd really open your options, i wouldntd say do a metal halide on such a small tank youll get alot of water evaporation and the light will definitly heat the water at least a few degrees, try an led fixture if you have some cash to spend, they are low wattage and provide gopod light penetration....just make sure the one you get is rated for a reef make sure to look up reviews first some led fixtures just dont cut it. that or try a 4 bulb t-5 fixture, id reccomend wavepoint or aquatic life, they are cheaper than others and provide a quality light.....try a varried bulb copmbo, im not sure what spectum bulbs acuatic life offers, but if you go with wave point, try 1 10 k bulb, 1 12 k (red) bulb and 2 actinics, this will give you a nice coloration for your viewing as well as provide good growing conditions. hope this helped. - matt
