Nooooo! Don't use Coppersafe. Jake, that stuff's dangerous enough to fish that you shouldn't be using it as a "preventative". Makes no sense.
Smartlove, how long have you had that Loach? We need to determine if it could be ich. If you've had him awhile, has there been any newcomers/plants or snails to the tank? *IF* it's ich we'll have you add salt at 1 TBS/5 g salt and crank the temperaature up to about 87 degrees. But we should determine 1st if it's ich or not. The white spots you describe sound. like it but it almost looks like he's got a fungas on him....? Are the other fish affected yet?
I don't think it's velvet because velvet kills so fast you wouldn't have had time to post about it.