I bought some Physon 20 so that I have it on hand if I need it. The directions say to mix 2 tsps. per 20 gallons of water. Do any of you mix smaller amounts? If so, what proportions do you use? Also, if a plant is infected with fungas, do you spray it on or dip the plant into the mix? Sorry about all of the questions, but I want to be sure I use it correctly. Thanks.