The original post has been updated to reflect the final polyp counts. The DT increased by 25 (109%) The FT increased by 42 (182%) - All in all, a dismal performance.
Although Zoas grew at a faster rate in the FT under the Maxspect G2 LEDs, I'm unable to attribute all of the variance to the light units. Over the course of the contest, there were too many variables to consider the results a conclusive comparison namely,
- Experimentation with carbon and bacteria dosing resulted in multiple bouts with algae and Cyano blooms, some severe enough to completely cover the contest Frags.
- About midway through the contest, I altered the LED configuration in the GS, replacing many of the stock, SemiLED emitters with Cree and adding additional wavelengths including Cree Blue, Royal Blue, cool white, UV and Violet.
- Also about midway through the contest, I added to 403nm stunner strips with reflectors to the AIs.
- Although I tried to initially match PAR and flow between the tanks, the Frags in the DT ended up with higher PAR and flow.
In addition to the above, I suspect Allelopathy may have played a role in the growth issues. Over the course of the contest, I was collecting additional corals for the Nano contest build. At one point, the 17 gallon Frag tank alone held more than 350 corals. This in addition to the 80+ corals housed in the DT. These existed in less than 50 gallons of total water volume. Virtually every inch of every rack contained Frags....
The rapid increase in coral density caused changes in CA/ALK uptake requiring large increases in 2-part dosing (increased to 120ml/day of each in addition to Kalk and weekly 10% water changes) - So much so that salinity creep became an issue. Now that most of the new Frags have been moved to the Nano, water parameters and dosing are returning to normal. It will be interesting to see how this impacts future Z/P growth.
All in all, I think there is one conclusion that can be made - I can't grow Z/Ps
