I have a 15 gal. aquarium with 3 otos, 2 bronze cats and a betta. I was
planning on putting about 4-5 Australian Dwarf neon blue rainbowfish in it
(I have about 9 rainbows in my 48 gal. and they are nice and active and try
bite my fingers).

IS a 15 gal too small? Will they outgrow it in no time? I know my rainbows
in my 48 gal. love to swim around a lot and they are about 4-5 inches long.

If not, what fish would be bright and colorful, schools good in 4s or 5s,
long bodied like rainbows, very very active, non-agressive, and of course
good for this size of aquariums? My wife loves those blue neons...I could
get a school of what---10 or so?

THANX.