Dwarfs
Fish Connoisseur
Plecs attach and suck on ropefish and bichirs, so it isn't impossible the pleco did this 
Wow what type of cories are you talking about,
You're probably right about the water, the chance of it being the pleco is very slim. I should have written that in my other postCheese Specialist said:I don't agree, I would put money on it not being the plec.
Peppered cories do well in cooler water. I used to keep some in with my goldfish.wrs said:Wow what type of cories are you talking about,
I dont know, I just know I read that there were coldwater ones.