I have 4 t5s on my 90 and yes i already have the 180. I am not sure on what type of corals yet. It is gonna start off mostly fish and gonna slowly incorporate corals since I have never had them before. So I want to make sure all my levels to be perfect or as close as possible first. That being said I don't want to get lighting and then find out it is insuficiant for something I want in the future.
I have been looking at 72 in 8 or 10 bulb t5s or the other option is three 2ft MH
with a couple t5s for color.