As a relatively new shrimp keeper who has been/is struggling with pressurized CO2 in the tank, my advice is this; focus on one thing at first.
Yes, there are many people who successfully manage to run CO2 in their shrimp tanks. The odds of you becoming one of those people on your first try while you're still learning everything else there is to know about shrimp-keeping is low. Shrimp do not like high CO2 levels or pH swings (which injected CO2 on a timer will cause), so you're just stacking the deck against yourself by trying a high-tech shrimp tank on your first dance. I would suggest focusing on either a high-tech planted tank or shrimp. Get comfortable with one before attempting the other. You can always get shrimp first and try to acclimate them slowly to CO2 later once they're comfortable in your tank, or you can grow a high-tech CO2 jungle with no shrimp, then go mid-tech and try to add them.
I know this isn't the most exciting advice but watching your colony slowly die for unknown reasons over the course of weeks to months is really frustrating and discouraging (speaking from experience).