Thanks Frank. Justed ordered the 132w kit for the 24 gal DX. Should be enough I hope. about 5 1/2 watts per gallon and it's not deep at all.
The cool thing is, it's a total of 4 lights. 3 x 36 and 1 x 24 so my thought is to I'll be able to dial-in the types just how I want them.
Thanks again,
Mike