Stick with raw meaty seafoods. Frequency can be determined/balanced with quantity. Meaning you can feed daily without issue as long as you do not feed to excess. The trigger must be fed at least daily. Scallops, shrimp, krill, squid etc.
With the puffer, do not rely on soft meaty foods for a majority of it's diet. The puffer needs "in shell" seafoods on a fairly regular basis. This will help file down the teeth and keep them from overgrowing the mouth and preventing feeding. Just be sure any live shellfish is frozen 2 weeks prior to use so you ensure any parasites/bacteria have been destroyed. If you're not too sqweemish, you can also crack open a few snails.
As with all fish it is very important they get a variety of different foods, vitamin/HUFA enriched and some veggie matter. With carnivores, they need much less veggie matter but still some. The thing to keep in mind is they eat the whole animal in the wild which means the digestive/system gut which also contains a fair amount of algaes.
Cheers
Steve