Or maybe blindingly obvious, I guess that's why I'm asking. ;D Over the last few hours I've noticed my Swordtails (one male and one female) occasionally swim up to a Neon or two and very gently have a quick nibble at them (Or near them, it's hard to tell at times), then go about their business. The Neons will swim away mostly but not with much urgency. The neons aren't showing any signs of illness as far as I can tell, and the Swordtails are generally keeping to themselves so I'm not sure if there's anything I should be worried about. I might be worth knowing that the Neons have mostly been staying in one area of the tank in the last couple of hours, slowly moving about. I'm not sure if it's a sign of anything or if they're just chilling out! ... and just as I wrote that I found a dead Neon, leaving me with three. No signs of illness or injury at all. The tank is still cycling and I was advised that a few fish would help, but I'm starting to regret getting any at this point. I just feel bad for the poor fish. :-[ The swordtails don't seem to be bothered though, I just hope that really is the case.