So, I'm considering an upgrade in tank size to better accommodate my fish, as I feel long term they need more room. Current tank dims are 32x24x20 My question is, what's more important, length or front/back depth? I know for the big swimmers, like tangs the length is key. My tang is a kole so..can be suited for a somewhat smaller tank. Options I'm looking at are: 150g - 60x24x24 120g - 48x24x24 100g - 60x21x21 Typically my thinking is that the front/back depth is mostly for aquascaping options, but I wonder if 3" is really THAT noticeable? Equipment wise I think they're all pretty well a wash. I need some input friends! And constructive input not just "go as big as you can".