[rayjay]

I have no way to know just how many mysis my erectus would eat each day, as I broadcast feed by portion not numbers, but keep in mind though that it's not just the numbers of amphipods available to them each day, it's how many they are able to catch as the amphipods aren't just available like frozen mysis, they tend to hide most of the time lights are on. The amphipods will still get caught but without an extreme population of amphipods, it's doubtful you could sustain them for long, especially if the absences become frequent.
Definitely are great as ancillary nutrition though.