pc / t5 and metal halide help

[fishguy007]

i went to upgrade my ligthing today.

i currently have a 30 gallon aquarium. i want some good lighting for my corals so that i can get some growth.

currently i have 2 * 65 power compacts running the tank. is this enough??????

i went to put a 150 watt metal halide on the tank and the store told me that that would be over kill lighting. is this true. ???????????????????????

the suggested that i convert to t5 lighting and just use that. any suggestions.? is halides bad for this tank and is t5 better than pc's? also how many t5's should i get.