It is an old wives' tale for the most part. Line up 10 neon tetras, and put those beside a 10" oscar....big diffence.
They key is really to use <i>mass</i> of fish, but I forget the calculation. Basically, the 1" of fish per gallon <i>sort of</i> works with itty bitty fish. Neons, harlequin rasboras, white clouds, etc etc.
But what I usually do is use common sense, and understock tanks. No reason to cram them into their tanks like sardines.
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I am highly prized for my meat. :eb:
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