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You could go for netrite snails (i think that is how u spell it). Personally I love my zebra netrite snails. They are always moving and eating algae off the glass. Other than that your kinda limited.
I forgot about the shrimp but yes they would work; my betta didn't mind red cherry shrimp but that is not always the case. Also my snails love algae waffer, cucumbers, and zucchini.