Harlequin Rasboras twitching in place?

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Slurpuffs

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Nov 27, 2014
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This only started today, but almost the entire school of Harlequin Rasboras in my tank are all confining themselves into the bottom left corner of the tank, just kind of twitching and wiggling in place. I managed to get one of them on camera, but keep in mind that there's 4 out of the school just doing this for hours side by side:

https://www.youtube.com/watch?v=BQDiJ9S6cFA

Should I be concerned? I thought it was just a weird mating ritual, but they've been doing this for hours together and nothing else.
 

Duckie

AC Members
Mar 14, 2015
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What size tank, how many rasboras, which other fish in tank, how much current in tank? From the sound of it your group is too big for your tank if they seperate and never do anything together. Tank beeing too small for swimming requirements, not overstocking due to many fish. Otherwise what those 4 do looks like just swimming in place against a current, nothing to worry about. The one thing that does look strange is that they are seperate from the others, which is a bit strange.
 

biondoa

AC Members
Feb 6, 2015
397
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Alison
Mine do that fairly often. I haven't seen them do it for hours at a time, but it seems to be just something they do a few times each day.
 
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