I have 9 cardinal tetras in a heavily planted 20L gallon aquarium w/ 2 small angelfish, 2.5 watts per gallon/co2, fertilizer...I noticed my tetras have ich. Temp is about 78 degrees right now. Do I treat with normal ich medicine? my ph is about 7.0, ammonia is low and I have 1 small air pump for the fish. I know ich isnt serious but I am worried about my plants and fish-what do I do??? Help! 