I tried green swordtails with firemouth and salvini the swordtails were longer than either cichlid and I found them all one at a time every morning in pieces throughout the tank. The bristlenose enjoyed the remains...
Id say jewels are as bad as salvini.savini did it, they have teeth, i would never try with something like that. I have seen them tear out the stomach of a full grown firemouth. SOmething was ripping out stomachs of my cichlids in my six foot tank. I thought it was oscar till i saw the salvini do it.