If a fish can't swim without having to avoid other fish (due to space, not agression), it is an overstocked tank. Can you grow fish like this? Sure. Do I agree with it? Absolutely not.
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not being a solo tank ( or a tank of small, shoaling fish ) is there a situation where this does not happen?
I fully understand the aesthetic argument. Some like it full some like it less so.
But in terms of fish keeping what is wrong?