Mixing different sized angels?

[Casper2000]

I currently have a 72G bowfront with 18 harlequin rasboras and 4 quarter-sized silver angels. Today at an LFS I saw a bunch of large, maybe silver dollar coin-sized, blue zebras. I was wondering if it would be possible to add two of these big guys with out them harassing my small guys too much or even killing them. The tank 40G breeder they were kept in at the LFS had various sizes from XS-L all mixed in one but had A LOT more than just 6 angels. There's lots of driftwood in my tank to hide in and break the line of sight as well if that helps. Opinions?

 

[alexanian]

Well there will surelly be some picking as the newcomers establish themselves on the top of the pecking order. I don't think there will be anything serious since u have 4 there already so the aggression will be spread and u have enough tank space. I'd personally try it and watch closely in case any serious damage occurs. Try to find new angels that r only little bigger then the ones u have instead of getting the largest they have