hmm... you might like to take a picture of your tank to show us. Whilst we know you have glosso, we're not too sure if it's an open concept or a "wild" aquascape.
Generally, rummynose are good shoaling fishes. In a two feet tank, you can easily keep a school of 15 fishes beautifully. Otocinclus spp. are good algae crew for your tank too.
Cheers,
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