I recently noticed the ingredients on Snow Flakes shrimp food is 100% bio soy bran. Snow flakes make neos and Caridina shrimp alike absolutely flock to the food. But seeing as it's $25 for 30 grams, of course I am looking into making my own. A couple of sellers state that it is soybean skin, but not sure what part of a soybean would even be considered the "skin." Anyone fooled around with rolling your own? Thanks!