I have had a guppy tank since Oct and done very well w/ raising baby fry and no problems at all. I went back to the same store being "trusting" and bought some guppies yesterday needing some adult females to go w/ my fancy tailed males, needless to say I have an ick/ich infested aquarium now. This aquarium is only one of those 6 gallon minibows, the only other occupant is a mystery snail.
In my other tank w/ the infestation possibly is my new fish I am learning about, its a 10 gallon w/ 2 skirted tetras, 1 diamond tetra, 1 pleco, 2 red platy (bought from the ick store), 1 tatooed platy (from the ick store and no I didn't realize they actually tatooed the fish until I got home and researched about it now I want to find the cruel person and slap them), 2 dwarf frogs, and, 2 platys that are speckled black and grey, and 1 mystery snail. The red platys have some white specks on them now I am wondering if it is ick

?
The other tank I have is full of fry and one mystery snail and unharmed from yesterdays adventure.
I Have the following questions:
What do I need to cure the ick?
How often to I change the tank during the ick treatment? (my ciclid raising mother says once a week)
How much med per the 6 gallon guppy tank, how much per the 10 gallon tank?
and will it harm the other occupants in the 10 gallon tank like my frogs, pleco, and mystery snail?