it all depend what you want to house. the T5s will be 24 watts more then the MH
but you will also get the penetration you need and will be able to house anythign you want.
and remember a T5 is able to penetrate a 30" deep tank, thats 400watt MH
territory. a 24" tall is allmost the max i would go with a 250watt maybe a little taller but you'd have to worry about the placement of the corals
Originally Posted by mr_X
i would use an 8 lamp t5 ho
unit over a 90. i wouldn't put much stock in a 150 watt halide fixture. softies and lps
in a 90 IMO
. 2 x 250 watts would be better. watts per gallon is a useless measurement.
8 lamps is pushing it, thats not needed. a reefer at my LFS
has 8 lamps on his 90g and he has two lamps removed and his growth is still great