All tanks should have at least two filters. That way you can clean one without wrecking the other one, and then next month clean the other one instead, and so on.
Each one should be almost big enough to handle the whole tank by itself, for best results without overkill.
Having two heaters is very handy, in case one fails.
Corys are definitely "A" list fish, and 5 or 6 would be just right.
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