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Not bacteria. But it depends on what non plant organism you mean. Frozen blood worms. Or a little off cut of your Christmas prawn. But make sure there isn't any Thousand island sauce or oil on it! Seafoods basically , that means no beef chicken or pork.

I thought bacteria and other non-plant micro-organisms count as protein?

What’s an easy way to provide proteins then jayc?

No! Yes! Missing proteins for sure.

Right, so what if their entire diet is biofilm + IAL + maybe some other leaf + bacter AE. Is that a complete diet with enough variety? Or is it missing something, e.g. minerals, protein? To reply to some other points bought up: As for "swarming" the food, they don't do that. Maybe they are dumb or something, but it seems like they don't know to actually go inside the feeding dish for food. Once I put in the dish, some shrimp ignore it, but some others slowly make their way over to the dish and then wander around outside it. Maybe 15 minutes later, eventually one makes it inside and starts eating. One hour later, maybe there are 5 shrimp inside. (half of total) As for powder food, I won't feed that any more. In my last tank, I found out that uneaten bits will cause water pollution.

Bacter AE does have actual bacteria in it, which the shrimp can eat. It also has enzymes and other nutrients to help the bacteria and other biofilm grow.