Aren't cherry barbs mainly sub tropical fish? Which means they can survive at tropical temperatures but there lifespans would we shortened and they would've more succeptable to diseases. Similar to a guppies situation.
With 5 bettas in a properly cycled, filtered, densely planted tank I think that you could only add a small 6-8 school of smaller fish such as neons or cardinals. Have you thought about ember, neon, cardinal, tetras, or glo light , harlequin, and scissor tail rasboras
With 5 bettas in a properly cycled, filtered, densely planted tank I think that you could only add a small 6-8 school of smaller fish such as neons or cardinals. Have you thought about ember, neon, cardinal, tetras, or glo light , harlequin, and scissor tail rasboras