Pods eat algae, detritus and food scraps to a limit. this depends on the type of pods that you have. This is why pod "buffets" are sold. they give you a blend of pods in one bottle. I would wait until you have visible algae growth. this will aid in the pods having something to feed on. Its all part of your tank maturing. You may need to continue to add pods during the tanks life to keep your pod population up.