Haha! I had the same exact thing happen to me! One or two tablespoons of it and a couple months later there is an inch thick layer at the top! I took out almost all of it and dumped it in a pond where it can't be spread to major waterways, and hopefully the bullfrogs will enjoy it. Good luck keeping it under control!
My tanks (so far
5.5 gallon Planted Dwarf Puffer tank (2 Dwarf Puffers and a lot of RCS!)
16 Gallon Planted
(GBR pair, 3 amano shrimp and a whole bunch of snails!)