04-10-2011, 05:16 PM
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My first thought is n ot to put the Betta in a 20g. You have mentioned one good reason, another is that not all fish are compatible with a Betta (from both sides) and it would be nice to make better use of that space with more than just one fish.
You can do a lot with a 20g. I would not recommend guppys with gourami though; the latter are slow, sedate fish, and active tankmates shoulod be avoided.
If you like gourami, in a 20g you could have a trio of Honey Gourami [check our profiles, the name will be shaded if the fish is in our profiles, so click on the name to see the info], or a group of one of the smaller species like sparkling gourami, croaking gourami, licorice gourami, eyespot gourami. I would not go with the "larger" gourami as you would be restricted to one fish and tankmates can be tricky again.
With those gourami I have suggested, most of the rasbora work well; they are colourful, shoaling fish, very peaceful, and not too active for gourami. Harlequin Rasbora, Lambchop Rasbora, Hengels Rasbora [these three are very similar, the Hengels is my personal favourite for its bright copper mark], Eyespot Rasbora, or one of the tiny Boraras species like Boraras brigittae if you have the dwarf gourami species, Emerald Dwarf Rasbora, etc. Some of these depend upon your water, as noted in the profiles.
A livebearer setup is another idea, some fine gravel, rocks, few plants like Corkscrew Vallisneria, with a group of colourful livebearers. This if you have hard water.
By the way, you might get more "action" here during the week; I have noticed over my 2+ years here that weekends can often be slow, I guess the workers/students are out and about on weekends.