Upside Down Strange Behaviour

[Dancake]

I have 5 Upside Down Cats in my tank and one of them is behaving really strangely. All he does is swim around one end of the tank following the same route continously. The other 4 seem happy enough and school as normal but the other guy only seems to join in if he gets distracted from his patrol. He appears to be healthy and my parameters are fine.

Anybody seen this behaviour before?

 

[Miss Dib Dabs]

How long have you had them? Do you know what sex they are? Occassionally my synos randomly swim wherever they want to but they aren't the nigriventis (spl). It could be something is upsetting the fish and this is his way of telling you. Hope you find out the cause.
P.