If all you are feeding is krill, yes. Lockjaw, as it is described, is a deficiency of vitamin B1. Krill contains a great amout of thiaminese, which binds vit B1. You can feed krill with no worries if it's just a small part of his overall diet. A snowflake would benefit from squid, octopus, clam, scallop, shrimp, many seafood items you can get from the market and cut into strips or chunks. Using a multi vit and selcon is not a bad idea either.