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You really aren't going to see true schooling behavior in a tank with a small footprint like a 20 high has, but I have herlequins in mine and they do make a very nice display. I think 9 is the exact number I have in my 20, so that should work well for you.
Do you have plenty of cover for your shrimp? If not, there is a potential for the fish to eat them.
Do you have plenty of cover for your shrimp? If not, there is a potential for the fish to eat them.
