SO HAPPY - due in part to this helpful forum, I BEAT ich in my new 16-gallon tank with high-temp water (80-86 degrees - whoa!) and lots of sea salt - maybe 1 to 1.5 teaspoons per gallon... and my baby fantail goldfish have survived and are now ich spot-free. I'll keep water temps up another 2 days then slowly return back to "normal"... 68-72 degrees.
NO CHEMICALS! WOO-HOO! It worked! Thanks, Aquaria Central.