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I have 6 Harlequins in my 20g. They spar like that quite frequently. I always assumed that it's a kind of dominance ritual, that they are sorting out their "pecking order." I've never had any jump outs.
 

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Do you have a lid? Failing that, do you have a lot of floating plants? Both can reduce incidents of jumping dramatically, and you may want to try them if you want to get more rasboras.
 

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Fresh Fish Freak
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This can happen sometimes with fish that need to be kept in schools.

My advice- buy more Harlies (so you have at least 5-7 total). Pull all of them out of the tank, rearrange some things inside the tank so that the "old" fish feel like they're in a new territory, and then add them all back to the tank at the same time.
 

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Do you have a lid? Failing that, do you have a lot of floating plants? Both can reduce incidents of jumping dramatically, and you may want to try them if you want to get more rasboras.
I don't have a lid. I used to have floating water sprite, but I got rid of it a couple months ago. I've had the 6 Harlequins in my tank for a bout a year and a half. They are very active, but they have never jumped.
 

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Discussion Starter · #8 ·
Okay thanks. I know I need more but I don't want more. Instead, I'm going to give them back to my lfs.
 
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