Can I add one more tang?

[Max93]

Depending on tank size you’re limited with other tangs, I wouldn’t do 3 tangs in a 4’ tank (Or even 5’ tanks). I think 2 tangs is pushing the limits of a 4’ tank if I’m honest.

My tank is six feet.
Water volume display is 167 gallons with sump it’s 220.

it’s a waterbox 220.6z