Hi gollie - is there any way you can take a sample of your tank water to your lfs? Ask if they can write down your parameters and then you can post them here.
He doesn't sound well - especially if his fins are clamped.
Then if you can, please answer as many of the questions in the white box as possible - it'll help narrow down the possible causes
Lizzie - it sounds as though your fish has velvet disease. If this is so, as a suggestion, please start a link so we can bamboozle you with ways in which to cure your little moor

If you can, please give as much info on your tank, water params etc as possible and we can take it from there