I agree with Richard. Honestly there are a zillion issues that can cause this behavior. I think the thiaminase thing is a card that is way overplayed here. Not that it shouldn't be a valid concern... But to jump to that is just as bad as all of the python people that see a snake doing this and automatically want to blame IBD. Many of the Europeans (especially ones that either don't post here or left long ago) feed smelt on a regular basis. Not to mention the countless numbers of customers I had that fed goldfish and had garter and ribbon snakes that were going on 8 and 10 years old. Some of my local populations live on catfish, especially the nerodia down the street. It is no wonder customers would look at me as if I am crazy when I would recommend switching foods when they had been feeding a thiaminase laden fish for the Snake's entire life. I used to be really adamant about it and still will not offer goldfish, but I think that this forum as a whole needs to start taking other issues into account a little more.