I see absolutely no reason or excuse to ever use a thiaminase containing fish when there are already other things available that are totally safe without any additives! My elephant trunk snake will only eat live fish so far. These are a difficult species. All we sell is goldfish and rosies. I don't want to have to feed him these at all... So I special ordered him some feeder mollies through our store... (I had no idea we could do that!) 20 cents a piece! for feeder fish! bah.... but I'll go to any length to make his diet the healthiest possible!!! One day I WILL successfully sneak a f/t silverside in and he WILL eat it!!! or else!