I have one. Most aggressive fish I've ever kept. Was keeping it in my 90 with a jack Dempsey , firemouth and salivini. Sad to report, the jewel already killed my salvini and tore all the fins up on the rest. Now it's the only resident my my 20 gallon qt tank. I'm hoping the 300 that I'm going to setup will help with the aggression issues, but this is one nasty fish. Beautiful, but ferocious
On a side note, mine started out very shy and was relatively peaceful to begin with. Now...... not so much