those cherry barbs are going to be a delicious snack for the GT soon enough, just throwing that in there. Blu acaras would most likely even take a few.I've only read like 3 posts on my days of the internet of green terror actually being terrors. But at the same time, I don't think they'd make good tank mates for keyhole cichlids, even if they're not as extremely aggressive as people seem to say, they're still very boisterous, and keyholes are kinda timid.
I'd honestly rehome it. What are the other fish i your tank, anyway? Thinking of keyholes I think of other tank mates being cories and smaller tetras, which would all end up food for a GT anyway.
There's 2 Keyholes, 8 Cherry Barbs, and an Albino Bristlenose. I wanted a med sized centre piece fish the would be ok with the Keyholes & was told Blue Acara's have quite chilled temperaments, hence the purchase. I called the guy I got him from (although it seems "him" should be "her" so Proxo informs me!)today and he was adamant that it's a B.A.& that he hasn't had GT's "for a good while". He's invited me to pop down with the fish, or pics of the fish, tomorrow for a chat.
Not sure what to do as he/she is an attractive fish, but I couldn't let anything happen to my Keyholes.... uncertain & undecided....
Med sized center piece fish that would be more worth looking into imo would be an angelfish, A honduran red point (just make sure it's not a convict!) or a festivum. Red Shouldered severum might also work, depending on how big your tank is, as severums all get quite round and pretty large. Turquoise and gold severums get pretty huge, but I believe that red shouldered sevs stay smaller.
Those are just the ones that come into mind, but I definitely don't see cherry barbs working with acaras or GT's in the long run. And I still have doubts that a GT and keyhole will work together.