156gal
with a 5' length you get that nice big tank look with room for fish to cruise
a depth of 24" front to back aquascaping will be much easyier allowing open areas for nice big clams
Lighting you could always aquascape just in the midde leaving the ends empty or two piles on each end along with retro fit lights\pendants just light overs piles or mound
i would definately use 250w MHs for the depth of that tank, actually i would use 400s but thats just me
if you buy a smaller tank you will wish you had bought a bigger one later
with a 5' length you get that nice big tank look with room for fish to cruise
a depth of 24" front to back aquascaping will be much easyier allowing open areas for nice big clams
Lighting you could always aquascape just in the midde leaving the ends empty or two piles on each end along with retro fit lights\pendants just light overs piles or mound
i would definately use 250w MHs for the depth of that tank, actually i would use 400s but thats just me
if you buy a smaller tank you will wish you had bought a bigger one later