Just an active ray or it is a sign of a problem?

[MariaS]

My female does it but only a few times a month, I have seen others do it a lot, I expect he might Settle in and do it less. Young rays seem to do it more than old. I have heard of rays surfing in the filter outlets / power heads but never seen mine do it.

My black diamond girl does it all time!!
Glass climbing.. she smack it so hard its frightening sometimes... surfs the bubbles.. she does not stop!!!

Best is my son's black diamond.. I promise this is true.. she sprays water out the one corner of the tank where the one lot of pipes run, all the way across the room and gave my daughter in law a shower !!
She does this quite often...

 

[giar]

Ok so i know black diamond is just a variant of leopoldi stingray, what i wanna know, is he considered as "Black diamond" or more like other leopoldi?