CO2 rate

Wasserpest said:

One or two bubbles per second seems like a safe starting point.

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Then check your drop checker for the color. Although drop checkers aren't completely accurate, they can give you some idea of how much CO2 is in the water. Blue is too low, green is about medium, and yellow/green is about right.

Keep increasing the bubble rate very slowly while watching your drop checker and your fish. Make small changes and wait a few hours for the results. As long as your drop checker is in the blue to green range and your fish are fine, you shouldn't be at the point of gassing your fish. But as you get into the yellowish range, you want to watch your fish very closely and make your changes very slowly.

Keep increasing the CO2 until you see your fish stressing. They'll start hovering at the top of the tank, gasping for air. At that point, you're too high and need to decrease the bubble rate. You can do a quick water change to help the fish.

Then keep watching the fish at the lowered rate. If they're fine again, then that should be your highest CO2 rate. Watch your fish very closely for the next 24 hours, and then keep an eye on them for the next couple of days just to be sure.

So I use the drop checker to give me a general idea of how much CO2 is in the water and use the fish to tell me when I've hit the point of going too high. By reaching that point and then dropping back a little, I am able to inject the highest level of CO2 in the tank that's still safe for my fish.

you very likely to run into issues with streaming it into an intake of a canister,you better off making a reactor keeping less strain on the motor and having the chance to air lock it depending on the type and flow rate. it will also keep it much quiet.

a dc isnt really needed and can have its own issues with a tank that big due the the flow of the tank if you have the filter on one side it might not circulate though the whole tank with the same co2 levels. depends on the scape, flow outputs/intakes, gph, etc,etc so just plan and test for better results, if its not housing fish you might try and drop some type of coloring device for the water to see where ur flow is in the tank so u can adjust accordingly. in all honesty your co2 will likely be high enough that u cant judge it by bubble count unless your using multipul ports/needlevalves.

idk if your new to these types of set ups or just new to tpt, if its the first reseach everything now to save yourself huge headaches and $$ later. hope it helps.