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post #29 of (permalink) Old 12-05-2012, 02:49 PM
Planted Member
Join Date: Nov 2012
Location: Santa Cruz, CA
Posts: 289
If it grows to be more than 2", I'd say its too cramped in a heavily planted tank that won't have all 5G of volume as available swimming space.

If it grows to be more than 3-4" then a 20G at the smallest.

There are more exceptions at the 1-2" level but next to none at the 4" level.

That's usually the role of thumb before its reviewed on a case-by-case basis. However, I would say that the 3-4" rule is pretty universal regardless of the fish you have.
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