the 2 i have are in a 10 gallon with a fale wall works out to about 8 gallons of water space and they are with a sexy shrimp a cleaner shrimp and a pepermint shrimp the olny realy major movement they do is for hunting. they polish of sandsifters like there is no tomorow. the olny real space you need in a tank for them is enough floor space to lay a satrfish on dont worry about room for it to move around they dont last that long the harlequins are preety efficent hunters. well my female is haha the male just hopes she lets him have a bite
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