Try soaking your food in garlic as a treatment for a mild case of ich. You can also use Garlic Xtreme made by Kent.
I agree with not adding anything right now until this clears up...assuming it is ich. Stress is one of the causes of an ich outbreak...if the disease is present in your system. Also, Blue Hippos are prone to ich if present in the system.
Keep in mind as long as there is a host fish the disease can remain present in the aquarium. In my opinion, garlic or a gralic produst is an excellent choice in combatting and preventing ich outbreaks.
Provided ich is presnet in your system the following can cause an outbreak and could wipe your tank out:
Poor water quality
Stress
Poor diet
Concentrate on boosing the immune systrem of your fish with garlic and vitamins even after there are no visible signs of the disease. JMO