So I know my tank is too big to really be running DYI CO2. Would it hurt though? Would it help? Seems like it would make sense to say even just a little CO2 would help as opposed ot non. I could be off on that though, I have no clue. Just looking for help.
Fluctuating CO2 can be as bad as not injecting any co2 - plants are slower to respond to co2 availability changes than algae - so, algae wins. If you can keep your level stable via DIY co2, then it will certainly help. If
. You'll want to run 2 containers, switching one out weekly or biweekly so that one is always outputting strongly while the other is running out - this keeps levels lower.
Again, price the quantity of sugar and yeast you'll need, not to mention time, over a year or two. Then look at what pressurized costs. It's not for no reason that most people use pressurized co2 that want to add co2 to their aquariums.
You may want to just go total low-tech (no co2 supplementation) and limit your lighting period since you are on a budget. Or do what you gotta do to get $150-$200.
Maybe one thread for the questions, as what you are asking is all inter-related.