Daily 30% water changes while carefully vacuuming the substrate will help. You can use regular kitchen salt, iodized or otherwise at a dosage of 1 teaspoon per gallon, to help disrupt the osmotic pressure of the ich cysts, also. I don't use meds in my tanks to treat fish with ich, just the water changes, heat and salt. It works fine, and doesn't kill your biobed.
Barbie