I think the 4 bettas would work, but they will each need their own territories, which may not be possible depending on how many other fish will be in there.
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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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