new house new tank

[e46er]

So I just bought my first home and obviously need a tank.
my first reef tank was a 120 now I currently have a 250 DD in my shop but I need something for home.

strata says "a reasonable size with a reasonable number of fish" not quite sure they would see the 250 as reasonable.

Im not home a lot, Im home every night but usually only for 2-3 hours before I go to bed so Im leaning towards a small tank thinking 60 ish gal max. whats everyone preference for a small tank? it will be going in the den which is open to the entryway with a 1/2 height wall and large walk in entrance without a door. room is roughly 10x10 and will just have a small desk in it for any work I need to do from home.

Ive never had a cube which i think they look cool but not sure how easy they are to scape and for flow?? tank will be visible from 3 sides and will be an SPS tank. Im super happy with my evergrow lights over my 250 and my colors have never been better so Ill probably go with them again. I will probably get an apex jr dont think a small tank will require the full unit, which I have on the 250 so if I ever set up a bigger tank than that I already have the full version.

open to suggestions and not against the RSM and JBJ all in 1 tanks either........
any thoughts on optimum size/shape for small tank?