If you are using the 10 gallon in your sig, I do not believe you will be able to find an suitable fish. Siamese algae eaters get up to 5.5" and the chinese will be even larger and at that size they may be able to damage your plants. Your betta may also pick fights with them. Loaches need to be in groups and the smallest one grows to 2.5". They can also be aggressive and may nip at your betta's fins.
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