Is this too much flow for acans?

IMO that's a bit strong. Put a rock or two around it... few inches away. Maybe a little taller rock? That will still keep them near the flow, but it will be dispersed or broken up.
If they start to loose body mass or tissue, it's from rubbing on the skeleton. Then definitely move them. Takes a month to recover from damage.
 
I moved them the day of this thread, here they are now.

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https://www.youtube.com/watch?v=H1PFFrSW5cQ

video of the tank, I have a gyre @ 90% here and a cheap sun powerhead
 

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