I don't imagine your plants mind a 10000k very much when there's 192watts overall. Quite a few people do that. Some argue that the listed color temps are worth nothing more than aesthetic value to people, not actual spectrums seen by plants.
You'll want to have at least two reactors going at once in a tank this big, and a good diffusion method will really help. I diffuse DIY in my 30gl with a limewood airstone under HOB current on one bottle, on the other bottle I run the tubing into a homemade bell diffuser (bottom of a 16oz pepsi bottle, upside down, suction cups) which is placed near some current. I have no problems reaching 30ppm CO2 this way when the reactors are at full production, but your tank is bigger so DIY will be less efficient. Co2 concentration in my 30gl tank can vary all the way down to 8ppm, the usual is between 15 & 20ppm, that's how inconsistent DIY can be unless you stay on top of it and stock up on sugar.
The fizz tab thing you have might not give you the results to be worth staying with it. Once people see the results DIY can give on a good week, the inconsistency of it and especially of the fizz tabs, along with the attention required drives many of us to turn toward pressurized systems.
My ratio/mixing method for 2L bottle:
1. 1/8 tsp yeast + 1/2 tsp warm water + pinch of sugar into a small cup, whisk until bubbly, set covered for 10 minutes
2. 2 cups sugar in 2L bottle
3. fill half way w/ hot water, 1 drop Prime, 1 pinch baking soda, shake vigorously for 30 seconds
4. Fill to 3 inches from top with cool or warm water, resulting in warm overall mix*, add yeast mix, shake, hook up to tank.
*A warm mix will collapse the bottle as it cools, which will pull tank water into the bottle. Use a check valve between the tank and bottle to avoid this.
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