How do you recommend I get rid of aptasia in a smaller tank? Are there any techniques or methods I can use?Aiptasia x will create more aiptasia. However a coppperband may eat them for you. I personally think that aiptasia in a big tank is much more difficult to deal with than in a small tank.
As for depth, I personally like deeper tanks because it provides more swimming room. Height is good if you are gonna have giant sps colonies but I like longer tanks because tall tanks are hard for me to reach into.
And maybe I would like a tank maybe in the middle of tall and shallow from what you are telling me