Ok, that is a big tank, roughly 92 gallons. I am unfamiliar with your RockZolid filter, but you can install the CO2
according to your diagram, it’ll be fine, but I would put the diffuser in the rear central area of the tank and provide ample water circulation to ensure the CO2
mixes well in the aquarium. It doesn’t have to be a jet stream,…just enough to circulate the water.
Monitor your pH and aim for 6.8-7.0 optimal level. To do this you can use a pH test kit, mount a drop checker on the glass, or use a pH controller. Using a pH test is the fastest way to check your pH level, but it can become a hassle constantly checking the water. A drop checker, which is what I used, is less laborious and provides a nice, constant pH visual, but it does take some time to change color. Just ensure you adjust Bubbles Per Minute (BPM) slowly over a few days period to find the correct dosage. DO NOT OVERDOSE OR YOU WILL KILL THE FISH! The most accurate, fastest, and most expensive route is to purchase a pH controller. A pH controller will automatically maintain proper pH level in the tank by turning the CO2
ON and OFF when necessary.
I hope this helps.