I would only feed your frogfish 2 or 3 times a week depending on how much you feed him at one time. They are gluttons it is true especially the Sargassum fish which is a terrible choice with your lionfish as he gets much bigger than the lion and will eat the lion. If the frogfish is a real small specimen feed just a couple of small pieces of food at first or a couple of feeder fish depending on how it goes. It is easier to overfeed. A larger specimen will need more food at one time. I would start with the lionfish first and make sure he is eating well before adding the frogfish.
James