I'm not adding anything until I get an FX5 and my water is perfect/good parameters. My fish are super small, and the jag is under an inch right now, which is why I want to get all the somewhat aggressive fish now to grow together before I move them into the larger tank I am searching for. I agree the Frontosa would almost look out of place, but they are just so badass to me I want to include it in the new tank. There is a LFS by my house that has a lot of these fish together with a Frontosa and they get along fine and they are fully grown or close to it. Most likely I will try to pick one up after a while that someone doesn't want and see how it works out. If not, I can find a safe home for it anyway.