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Yeah it's a 72". The two fixtures are 5 inches apart which makes the pucks 12" apart. How far apart would you recommend spacing them? The meter is a Bio-tek marine.
Also has anyone ever had the lights randomly turn on and off? I've noticed them randomly turn on at night at like 1am. Then turn back off. Even today I noticed one side go dim then go back to normal. I wasn't even in the app so I'm not sure how that happened.
As far as spacing I would divide the tank in half and center each one over its own half of the tank and lower the light to about 7-8" off the water, maybe 9". Your tank is deeper than mine so you don't need to have it higher, 7" is the sweet spot for 36" spread I found. Even maybe lower inyour case.
Edited above
There is a known bug in older app versions and firmware. Make sure you have the most current of both.
You need to keep in mind that this light wasn't designed to create high PAR/PUR number "hot spots". It's designed to have a nice even coverage of light that will grow anything, and everything, everywhere. Once you have the light positioned look to the lower part of the tank and make sure your getting good spread and coverage there, you will be surprised.