They are fine, we have two that are about 1.5" and two that are less then an inch. They are always chasing each other, but don't really do any harm.
The frogs are brilliant, but the Barbs eat their Bloodworm, so I hope they are getting enough food.
The Plec that died had grown to about 3" in 4 weeks, and died as soon as we added the other Plec, don't know why though as it had no signs of infection or anything.
I'm thinking of getting a siamese fighter but I'm not really sure how it will be in the tank, might just leave it as it is.