How many 3 inch Clown Loachs can I fit in a 75 gallon
These guys get LARGE! 12+ inches so I would say unless you plan on larger tanks in the hundreds of gallons don't waste your money or time. I would t do anymore than four for a 75 grow out situation. We do not know what your other stocking levels are either so the four would also depend on what's already in the tank as well. Clowns are also susceptible to ick, so keep that in mind too.
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it would take years for a foot CL. Also once they hit 6-7 they will considerably will grow slow. Also for a grow out tank, you should atleast have a 125g or more if you're going (and you will, believe me) add more tankmates. You may start 6-8 Clown loach.