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I have Harlequins and they are mid tank dwellers not top (or at least mine have been for last 7 months)

I have not had fish for long but 18 fish in a 60l tank sounds a bit busy, once you plants establish there won't be a lot of room for them.

I have a 90l tank and the most I have had at one time is 13 fish and 3 shrimp, and that was just about comfortable for the fish. The tank could cope water quality wish due to the plants, but think it will be a bit cramped.

Anyway, I am sure someone with better experience than me will let you know.
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