hello again everyone! so about 3 of my 30 neon tetras have some ich. I'm miffed. (loach has a couple spots,too.) My temp is at 83 degrees, and from what ive read the ich should have fallen to the bottom now??? anyhow, ive been doing daily half doses of rid ich. dont know what else to do. ive got a sand substrate, too, so i was wondering if that makes it harder to kill the ich off?? any advice would be great.