It may take a while to dry the leaves naturally. Pressing them within napkins in books may help to remove moisture faster, especially if you remove them daily to air out the moisture from the napkins. If your oven can go to a low but warm daytime temperature (about 80-100 F) it may dry them faster, but may also damage the tannins. Be very careful not to burn the leaves if you try using the oven; it may help to use an oven thermometer to confirm proper temperature, as well as to open the oven periodically to let out some heat and moisture.
Naturally, if you have a dehydrator for drying herbs or jerky; that would be the best hasty option. I'd use the setting for drying herbs, and a thicker herb if many options are listed. After reading your post, I think I may try tannins and epsom salt for treating my ill fish.
Edit: I'm fairly certain you should strain the leaves out to keep your water quality cleaner.
Last edited by GamerGuy; 11-02-2011 at 04:42 PM.