Hi Dar
Ich is the white spot disease that our fishes get. Anti-Ick is a chemical solution to treat this disease.
Ick or Ich can and will spread with hands, nets, plants, filters, water, fish, gravel, etc. The secret with ick is prevention by careful fish selection and occasional anti-ick treatment if there is any suspicion or confirmation that ick is present.
You have to be careful though with fishes without scales. Here's a couple of sights that I read.
http://www.skepticalaquarist.com/doc...h/fungin.shtml
http://www.thetropicaltank.co.uk/hdcolumn.htm
Medications Clinical Signs Look under clinical signs to see if your fish has these symptoms
Hope this helps
Kind Regards