[Z-man]

I used to have a fresh water aquarium - I also had an undergravel filter coupled with a standard filter - the two in harmony work very well, as well as a couple of algae eaters and you should be fine.

IIRC, Tiger Barbs are very aggressive fish - the adult ones may have attacked the baby barbs. You can always put a temporary barrier between the older and younger fish while the younger ones grow up a bit.

Hmmm - maybe I should setup my tank again. I need a pet. But fish are so unruly - no matter how much I've told them, they always seem to want to swim right after eating! (Sorry, that's a real, real bad joke!)

-Z-man.