Starting a new tank

[TheCoralHunter]

Yes my wife is shaking her head and trying to hide the checkbook.
I have decided to get yet another tank. Although I can't decide what size. I have determined a 180 is the largest i can fit into my home. I do not want to go any smaller than 125.
Anyone have any selling points to going with one over the other?
Besides the obvious more space to fill :)
Is a 55gallon sump too big or not big enough for either of these tanks?

I'm currently running a 75 reef tank. Its been up and running about a year now.

[David Groos]

Personally I like the 150! 6' lenght and 24" front to back! Plus it's rather shallow and thus doesn't require extreme lighting and electric bill! 3 250 hqi's would suffice!

Dave

[iceman716238]

how deep is the 150gal?

[ecugman]

I believe it its 18".

[David Groos]

72x24x20. That size tank has had my eye for quite awhile. The 180 is 72x24x24. Every time I goto the LFS my wife cringes as I check out the larger tanks.