One of the pleco has a white spot on its black eye, as well as a whiteish coating over the length of its body. I think that its been like this since its been brought home. Could it be that the fish is sick and was sold ill?

Your fish is sick.. More then likely he was sick when you got him.. moving him around and changing environments made it worse. You're going to get medicine for eye cloud... If you're going to treat the tank, get Melafix for pond...

Well it's a little late I woke up this morning with him floating up the tank. I'm going to go back to the petshop and raise hell about them selling me a sick fish.