hey guys, I have been tanning my fish with a borax/zinc sulfate mixture for years. It seems like recently zinc sulfate has been disappearing from many supply catalogs. I really love the results for this particular tan, and the price per tan is really very cheap! I was just wondering if anyone else uses Zinc Sulfate in their tans, and if anyone knows of a good resource to buy zinc sulfate from? Also, are there any replacements for zinc sulfate? Will aluminum sulfate achieve similar results? Thanks for any and all feedback!