Well. I went away for a week with college and my mum was taking care if my fish - feeding them basically. Well, she has always remained that my plec isn't alive because she never see's it move. So, whilst i was away i get a phonecall from her and she says "I think your plec is dead", and i though here she goes - it hasn't moved in an hour or watever. So i replied. "Why whats up?" and she said "Well its floating and the other fish are eating it!" So yes it was dead - killed by my convicts i presume. The water params were checked by my bro and checked out okay, so i guess the con fry i returned to had caused it.