display tank, maximum size you're comfortable with

[Parker]

I do and I don't wish I went bigger. When the tank was sitting in the basement on it's own it looked huge now that the cabinetry is in it looks a lot smaller. I'm right on the edge of what I feel I could maintain day in and day out.

[untamed]

Two years into running my 400 gallon, and I think I would have been completely comfortable running 6' x 6' instead of 6' x 4' (600 gallons instead of 400 gallons). It would not make any significant difference to the maintenance. That's my biggest regret actually.