I love my 29 gal
Bio cube! It's just big enough to have plenty of room, although not big enough for tangs, but small enough that maintaining it is a breeze.
I was real zealous about taking readings every day, then it got to be every other day, then once a week, now, I'm real lazy.
I do change out 5 gal
of water every week, so I don't worry about testing anymore. I put live rock in the middle sump in the back, use a good fiber mesh filter at the top of it, and that's it. The tank has been running 1 1/2 yrs and I only seem to lose the same thing everyone else does, emerald crabs, and cleaner shrimp.
With this size, if I want to be gone for several days, I can have the neighbor kid come over and feed and if I'm gone longer than a week, my LFS
comes in and does a maintenance. Eazy-peazy!
Every time I think about getting a bigger tank, I think of the time commitment for maintenance, could I be gone for days at a time, etc, and think I'll just keep the 29!