Since they are the only shrimp I have ever seen at my LFS, well PetCo actually, I bought a pari of bamboo shrimp today. I've read they are filter feeders. Will they eat freefloating algea? What about the brown diatomic algea that has invested my tank recently. One of the shrimp is camping out on the filter spraybar so I guess they are eating something but I was hoping they will fight the brown algea.