Basically, it doesn't matter how many fish you keep. What is important is to be able to maintain the water in a clean and livable condition.
Naturally, if you have more fish, the task of maintaining the water in tip-top condition for health is more demanding of you as a 'care-giver' and which also require effective bio-filters eg a sump or big canister filter or filters.
Thus, less fish often means less demanding maintenance.
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