Try Amano shrimp, they are pretty big and most fish wont mess with them, although you're Angelfish might be a concern depending how big they get.
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46Gallon Natural Planted Tank. 8 Harlequin Rasboras, 5 Amano shrimp, 2 German blue Rams, 1 Dwarf Gourami, 5 Platys, 1 Albino Bristlenose
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