what fish to add?

Any suggestions on what to add to this tank after its planted? 66g 4 foot long. Kep in mind plant safe fish.

I have 2 pearl gourami
2 swordtail
2 weather loaches
african ghost knife (6 inches long)
1 ornate male tetra (his wives passed on)
1 rainbow shark
2 flying fox (one might move, but they are juvenile and ok at the moment)

Thanks.

The dreaded ich, all females gone. I'd like something that schools...just don't want to go thru that again. I don' think my bkg will eat the bigger tetras, maybe little cardinals and neons.