Also i run a Compact uv Sterilizer on my tank and havnt seen a sign of ick or Hith,
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4393+4457&pcatid=4457
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4393+12711&pcatid=12711
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http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4393+12711&pcatid=12711
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4393+16748&pcatid=16748