Since the tank was only setup for a month, you should check the basic parameters like ammonia, nitrite and nitrate to make sure the tank is fully cycled before adding in livestock. Without tests its all guesswork, and any toxic spikes will affect the livestock. Sometimes it can also affect fishes rather than shrimps as the toxic spikes occur at different times, or could also have accumulated and affected their health over a period of time.
The watt per gallon rule is rather out-of-date and was previously only used for old type florescent lights. LED lights don't really follow that rule due to their improved power efficiency. Your current Up Aqua Z-Series light is sufficient for growing those plants in your tank, though if you want faster growth, you could also look at higher wattage models. But do remember that you would also need to increase Co2 and nutrients to match higher lighting to achieve faster plant growth.
As for the Co2 injection, you should be running it during the active photo-period, usually it follows the same duration of time as the lights, just that it starts abit earlier (to build up Co2 in the water) and ends abit earlier (to allow leftover Co2 to be used up). Just running 2-3 hours of Co2 injection seems rather little considering your light photo-period is 6 hours. Try running the Co2 injection at 6 hours too, but you can still adjust it shorter if you find that it works better.
Do note that with a 6 hour light photo-period and less Co2, the plants will also naturally grow slower as they are limited by the shorter period of light and Co2 limitation, so if you want to speed up plant growth, try gradually increasing the light and Co2 periods.
Make sure your drop checker maintains a lime green (light green) color when the lights are on. In addition, ensure that you mixed the indicator solution with 4dkh reference water (not aquarium water), or use pre-mixed indicator solution, otherwise the color readings will be wrong. Also note that drop checker color readings are delayed by 1-2 hours so what you see is not exactly "real-time", have to forecast.
Yeah, ideally the lily pipe outflow and intake should be on one side and the Co2 diffuser on the opposite side, so that the flow can move in a circular pattern and push the Co2 bubbles down and across the substrate where the plants are.
Like this:
Photo Source: http://www.ukaps.org/index.php?page=...h-planted-tank









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