they are all small, 1 to 1.5 inches.Jason_S said:freeze dried or frozen krill (I'm using frozen). I also have freeze dried baby shrimps that I feed them. how big are the puffers? if they're big enough you could also do small raw shrimps from your local grocery store. you can put a small shrimp in and let them eat what they want/need and then remove the rest.