How big can I go while keeping the same light?

[Beverly]

Originally Posted by mr_alberta

Do a 24x24x20 cube-ish tank for now and use less rock. That'll give the angel more swimming room for the time being.

A 24" long tank isn't going to do it for the dwarf angel, unless the other horizontal measurement is 36" A 24"x24" footprint is going to make the fish swim in circles, possibly stunting/deforming its normal physiological needs (from a thread on RC), even though he/she has rockwork caves to swim through/explore.

My rusty dwarf angel is in a 48"x24"x24" high 120g. The tank has less rock than most similar tanks I've seen. The tank has lots of open space and a maze of open rockwork for the angel and other two larger fish to utilize. Having watched the angel's movements throughout the tank, I really wouldn't recommend anything less than 36" long.

Just my 2 cents.