Hi, i have been searching information about metal halide and have not come up with answers. I have a 125g with a 55g sump/refuge fowlr tank. I want to ad some coral nothing hard to grow just easy simple noob coral. I have a 48" 4 bulb t8 fixture. Each buld is 32w. so i should have a total of 128w. I was looking at metal halides and came across some units with out bulbs and they say it uses a halogen bulb. I thought metal halides are different? they look like my 1000w shop light but the bulbs are a screw in type. can i just buy a metal halide bulb? should i even waste money with metal halide if i odnt plan on difficult coral? sorry for the rambling just confused. thanks!