Yeah I'd skip the otos... they are best when it kept in groups of at least 3 - any less than that, and they tend to be very shy and you'll never see it. How bout a ghost shrimp instead?
Also, they don't need plants to survive, but they feel better in the cover that the plants provide.
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90g pltd: angelfish [black, leopard, platinum, silver zebra & gold vt] · glass catfish · harlequin rasbora · neon & rummy nosed tetra · sterpai & spotted cory · bristlenose pleco
28g pltd: scarlet badis · oto cats · bristlenose
16g pltd: flame & honey gourami · cherry barbs
8g (soon to be 18g): 15 lbs LR · 10 lbs LS · YSP · zoas · shrooms · flame & hammer corals · brittle star · scarlet & electric blue hermits · firefish
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