I have to agree with Lupin and Wet Whiskers. my fire eels will exhibit this behavior if they gorge, which I as well try to avoid. I also feed them 1x daily.. and let them go hungry for a few days every now and then. internal parasites are always a potential with these guys ime. precautionary worming him i don't think would be amiss. I worm my horses,dog,cats regularly and don't think it would likely cause any ill effects to worm a fish who may or may not have worms. I'de have concern if you have any snails,inverts in the tank. and I don't think but do not know for sure if the Prazipro would do damage to your plants. Thats where a QT would come in handy.
though 12" after 2yrs sounds way to small to me, i'de have concern with stunting possibly?
though 12" after 2yrs sounds way to small to me, i'de have concern with stunting possibly?