Bad! Usually with lot of suface water movment, you lose CO2. A little bit is OK, but with too much, You might as well have no CO2.
thank you X2, i did re-do my return upward and alot of water movement at the top , to stop the plant bend , now i know why my drop check never same color before ..Water movement is generally good (helps CO2 and nutrients get distributed evenly throughout the water column). Surface Agitation- bubbles or ripples actually breaking the surface tension- is what you want to avoid if possible.