Shoot, I bred my pumilio in 10 gallon tanks per pair (prefer the 15/16/18 gallons tho) that where not vertical... the hieght is nice, they will take advantage of it, but its more that they just need ROOM. 20L vertical doens't give them much room they are lacking in either hieght or floorspace one way or another... a 20H vertical or horizontal gives them plenty of room both in floorspace and height, so either way is fine.
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