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I have a 46 gallon tank with 1 discus, 3 koi swordtails, and 7 cardinal tetras. Currently, I am experiencing problems with hair algae getting in the leaves of Rotala wallichi. I was thinking about adding some wild type Neocaridina to eat it. Would the discus eat them? The discus is around 3 inches long. The tank is somewhat densely planted. I also have some driftwood in there.