Proper light height

[Paul31733]

Hey everyone! I currently am running a fluval evo 13.5. I recently switched to an a. I. Prime and am wondering what height you guys run and why?

I purchased the 18 inch flex arm.

 

[Auquanut]

BRS did a video on the AI Prime 16 HD. They really nailed it down for SPS and LPS. Might want to check it out. Here is the link.