Merci, mais je' parlez englais seulment because my French is so bad and the spelling/grammar is worse! Your English is pas mal. Why are you trying to feed your snake to a bowl of pinkies?
From what I've been led to understand, it's the cyprinid family of fish (goldfish, carp, etc.)that possess the greatest risk to cause thiaminase troubles. Catfish, sunfish and trout for example are not in this category. Pinkies to mice are a "cleaner" food in that there is less odour from the relatively drier stool. Feeding needs be less frequent due to the high food value of this whole animal diet.
However, no-one on this forum has said that the switch to mice must be absolute. In fact it is recommended to vary the diet. So rotating fish to mice (including goldfish for example) is absolutely fine!
Moi, Michelle