Well snowflake is not a type of food that Shrimp will flock to in droves.
But we use it as a great holiday food, that can be added into the tank and does not break down for days. It doesn't foul the water even if it is left in the tank for a week.
Shrimp don't eat snowflake straight away when it's dropped into the tank. They will only start nibbling at it after a couple of days when it softens.
Snowflake is just a fancy name for what it actually is ... this is actually soy husks. The same soy husks that are fed to horses. Sold in 25kg bags for a fraction of the price paid when it is relabelled as shrimp food. It's a by product of making tofu.
This ^^^
isn't really food either. It's just minerals in a pellet form. Can't blame the shrimp for not eating it. It probably doesn't taste like food.
No comment on these two. Have not used them. But they seem to have some .... exotic (weird) ingredients.
Just because humans will eat chia seeds, doesn't mean a shrimp will.
Healing Earth - WTF!
My suggestion would be to try a feeding schedule of once every 3 days. So you are only feeding them once every 3 days.
Mix it up with some fresh food, instead of using processed food. Veges, leaves, flowers are a great supplement, just blanch and drop into the tank.
If you want a little project, try my DIY food.