I have ich in my planted tank as well. Since last week I started using Kordon Ich Attack and I used the whole bottle (16Oz) and Ich is still present in my tank. As far as I can tell it kept the ich under control, the ich spots is only my Neon tetra now. None of my shrimps nor snails died.
I went and bought 2 more bottle, I hope it'll enough to cure it this time.
And I got these for 14.99 each from Petco