I have a Finnex Fugeray on the 36 gallon in my sig, gives great medium light, great color (I like running the blue moonlights with the white, still looks white but with a little extra), doesn't get hot, has that cool led shimmer
. Very slim, the whole fixture is thinner/slimmer than just the bulbs in a 2 t8 fixture
Was affordable too, $70 on amazon if I remember right (for the 30 inch), very happy with it.
The ray2 is the same shape/profile but high light, was told to only consider if running Co2 or hanging the fixture higher than the stock legs
Check out the pics