I have a 20H (planted of course) and for about 2 years now I'm battling Malaysian horned snails. I am constantly getting plagued by them, up to the point that I can count 50+ on the glass at night without looking at the plants. Now my question is, where can I order copper sulfate thats aquarium safe/made specifically for snail control because I'm not having luck finding it in stores. If anyone can steer me towards a website that'd be great. Thanks in advance!!