alright well i decided im going to get an aquatinics 5 bulb T5 fixture for my 75. im still a little unsure on what bulbs to get tho. i know i want at least two 10k's in their for growth, but what about the other three bulbs? iv read that T5 actinics are kinda wimpy, so would i need three of these? what about 20k bulbs or actinic/white? any other suggestions?