Tinoil Barbs

OK so i gave my silver arowana to a friend (he has a larger tank) along with my large pleco, he also took 1 of my bala sharks off me and my gourami.

i am basically left with a SA tank now, although he had 2 tinfoils he was going to take to our lfs, so i took them off his hands.

will they be ok in my tank?

they seem quite skittish, always on the move but do look happy enough, they have been in two days now, the other shark is going next week, i have a friend who is having a large tank with just bala's and neon tetras.
i am amazed at how the tinfoils eat, they devour frozen blood worm and whole prawns as quick, if not quicker than my oscars!

What do you have them with in ytour 180?

Anyone also now if a red tail giant gourami would be ok in my setup ?