25 Gallon 24x12x20 for Angel/Discus pairs?

I'm just looking for something 24" or under to place side facing out. 5 gallons more than a 20H sounded like a good idea considering that both like vertical freedom.

I suppose I could use 36x18 tanks with a divider to utilize one pair's spawning to trigger another.
 
20 is the smallet size..I prefer 29 G (a bit taller than the 30G)

but breeders I know use 40's
 
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