I've used the RapidLED Oynx fixtures for over four years. Great company to work with (sales, warranty, etc.). Checked PAR in Nov 2017. Ranged 200-230 all across the bottom of my 24" tank (LEDs 7" above the water) at 100% power.
No experience with Fishbit. An Apex controls my Oynx fixtures.
The Oynx line was before the Coronas... I've heard the Coronas are brighter. I suggest three fixtures over a 72" tank.
My tank is 180g, 72" x 24" x 24".
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