[JustOneMore20]

Add more cories to the 29g....they are shoaling and prefer groups. I'd get atleast 2 more...4 more if you want. You could also add a pair of Bolivian rams or Apistogrammas.

For the 10g you could add a group of small tetras or rasboras like glowlights, cardinals, black neons, flame tetras, or harlequin rasboras. A school of 6 would fit nicely. Then you could add a dwarf gourami or male betta.

For the 6g I'd go with a male betta, some badis like Zoe suggested, some Tang shellies (brevis come to mind), or a few ADFs.