02-29-2012, 12:40 PM
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Yes on the floating plants, Water Sprite is ideal, also Brazilian Pennywort. Click the shaded names to see the info in our profiles of each.
On the Emerald, I also suggest a group of 3. The social interaction among these fish needs more than one, he may well pine away without company. Good maintenance (weekly water changes), live plants even just floating, will handle this. But you are full then.
There is some confusion among so-called "Emerald" corys. Often they are actually Brochis splendens, not Corydoras aeneus. Click the shaded names to see each profile which will explain the difference. In a 20g you are OK with the larger Brochis, but no more than 3; if they are true Corys, 4-5 is OK.