First of all I'd like to say sorry sincerely! I was missinformed about aquarium store having copper sulfate. They do have a copper sulfate chloride called cupramine. Manufacturer seachem, anybody use this?
I don't have an amazon acct. Or ebay account too complicated, I just go the store, the person I talked to at the aquarium store was new that said they don't have any of the sort. Sorry about doubting you and the others. I just hope what I got works, winters comin, I really drop my temps