Otocinclus aka Oto cat
The Otocinclus fish are one of the true "shrimp friendly" fish in the hobby. Their diet consists of only algae so your aquarium glass is going to be spotless and your shrimp safe!
If algae is not present in the aquarium, you can supplement their diet with fresh veggies like sliced zucchini or cucumber. Commercial type algae wafers will also work well.
The Otocinclus natural schooling behavior make them a mesmerizing site as they glide across the aquarium. Due to their schooling behavior it is recommended that at minimum you purchase 5 or more, and house them in at least 10g aquariums. The more room the better.
Otocinclus General Care:
TDS Soft - Hard
GH 4 - 12
KH 0 - 12
PH 6.2 - 7.5
Tank Size 10g Minimum, 20g + Preferred