I apologize for not having paid careful enough attention to this thread. I just noticed a couple of issues that need some more thought.
First, the fertilization schedule you mention Johnny, I would start with once a week, on the day following the partial water change, and observe the plant growth for a couple of weeks. If yellowing leaves begin to appear [and I mean, new yellowing after this schedule is started] then go to twice a week. Especially if you have root tabs for the swords, once a week should be adequate. It takes a bit of experimenting. Over the past year, I was using Flourish twice weekly; three times I went to once and after 2 weeks noticed yellowing sword leaves, so back to twice. Recently I learned [we never stop learning
] that the water conditioner that detoxifies heavy metals was probably detoxifying the micro-nutrient minerals in Flourish when used simultaneously; I changed to dosing Flourish the day following the pwc, and at the same time I went back to once a week from twice. So far, my logic seems to be correct--the plants are thriving, suggesting to me that the water conditioner was in fact nullifying some or all of the first dose of Flourish. There is no need to dump more nutrients in a tank than will balance the light and CO2, plus it wastes money. I would try once a week and monitor.
Second, the siesta. Erik or anyone, do you have evidence from a reliable source that this works to increase CO2 and benefit plants? I'm not saying it doesn't, but I've never read anyone who says it does. The siesta can sometimes help to reduce an algae excess, which we all know is caused solely by excess light beyond what plants can use in balance with the nutrients. But beyond this, I've no evidence that CO2 is improved nor the plants. And Johnny, I would also caution that a siesta of 4+ hours mid-day may be detrimental long-term. This also I have yet to ascertain, but it does seem a bit questionable. Just a caution at this juncture.