In the sea they eat small fish but they can handle fish about a quarter of their length. I would feed him clams every day.
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If you feed your fish frozen seafood from the supermarket you need to check the packaging. Whilst it may be different here in Australia, many packs (imported) come with a warning that it is not to be used for feeding of your fish. It has some additive which is ok for us but not our fish.I had fed actual shrimp (like, frozen from the supermarket - of course thawed!)
Ocean Nutrition Trigger Formula : Sea urchin, pollock, mysis shrimp, plankton, squid, mussels, salmon eggs... http://www.oceannutrition.com/frozen-foods-detail/trigger-formula
We make a food specifically for Trigger, Puffers, eels, etc. using fresh Carolina sourced seafood. We process everything in house and supplement with fatty acids, beta carotene and active probiotics. You can search our dealer map at LRSFoods.com to locate a retailer rear you.
This is the blend I would recommend, or even our Fish Frenzy blend if this is too chunky. Good luck!
http://www.larrysreefservices.com/lrs-chunky.html