i would go with the hang on 150mh i have that on a 29gl.the sun pod is close to the water the coralife mh you can adjust it higher giving you a better chance acclimating the corals to the new light, when i switched my corals from 195 watts pc to 150 mh lost a frogspawn and a few others started to bleach so i had to put them on the bottom i still only run my light 6hrs a day coralife has a 70watt mh just acclimate very slow