08-26-2010, 01:17 AM
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If you read the profile of the zebra danio, you will note it says not to keep them with slow sedate fish such as gourami. The danio are active swimmers and may stress out gourami which are slow cruisers, and may nip fins. Not a good match in a 20g.
The cherry barbs (6+) are fine with honey gourami. And the corys (5-6). And one small pleco, but I would wait until last just in case. When you have the others you may not want more, corys can be quite entertaining on the substrate.