The best replacement for corydoras is otocinclus.

The best alternatives to corydoras are rated as following:
★★★★★  otocinclus

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Speaking about corydoras, one probably shouldn't forget about cichlids.

Other search terms related to corydoras and their ratings are:
★★★★★ cichlids
★★★★★ african cichlids
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corydoras
otocinclus