She means the shape of the Eclipse 12g aren't right for fast swimmers. There isn't really anything I can think of that would be fine in there that schools and with a Betta. Are you set on adding your Betta to the 12g? What is he in now?
What about having some female bettas in there instead (without the CT)? Or maybe some fancy male guppies and some type of shrimp? Or some Sparkling gouramis and shrimp. If you could find some Microrasboras (Boraras species), they might be ok, but I still wouldn't put them in a Eclipse 12 myself. They need as much room as other tetras and rasboras that are larger.
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Originally Posted by it4lian
I'm also thinking of adding a few amano shrimp, some snails and freshwater clams to keep the nitrates down
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I'm not sure why you think these keep nitrates down, but they don't. They will add to your nitrates actually. Only thing to keep nitrates down are water changes and plants. Plus, a Betta will most likely eat shrimp.
Your plan for the 29g looks good. You may have some issues with the Angel and Gourami. IMO I'd choose either an Angel or a pair of Honey Gouramis and not an Angel and DG.
If you went with Tanganyikan Cichlids, you'd be limited to shell dwellers and a pair of small Julidochromis or a Calvus maybe. An depending on the shell dwellers you choose, you may be limited to a pair or 2 pair.