Are they copepods eater? I have a banggai cardinal, observe that it keep on snapping on the aquarium wall, or sudden dash to snap on something in the water.
Do have some space constraint. Including Nano tank to be one of my choice.
Noted on the width. Thks for pointing out, thks to the rest for their input.
Beside 1ft, 2ft, 3ft, 4ft tanks...etc etc.
It is common to find a tank of 2.5ft in the open market(resell or really-made in LFS).
Or one have to custom made such tank? Dimension probably (2.5ft x 1ft x 1.5ft or 2.5ft x 1ft x 2ft).
Thickness of 10mm.