Mixing Clown fish

[Nauticus]

The smaller clowns like Darwin's percs and ocellaris are generally more peaceful and will not stray as far from their hosts. I do not know much about saddlebacks as I have never had them but if they are anything like cinnamons or tomatos they can be a bit more agressive and willing to wander when they get larger.
I think though since the ratio is two to one the saddleback should be more solitary and have less leverage.

As for the anenome, take it. The percs will not necessarily host in it. I have had clowns choose frogspawn and hammer corals over and above the good old anenomes.