Dose as needed to maintain the desired nutrient levels..
A low maintenance dose is totally fine given you aren't driving nutrient levels too low and starving the system..
Yes, I agree with Mcgyvr, but changes should be implemented VERY slowly.
NoPox, or carbon dosing in general is a management tool which can be very effective in lower nitrates.
Nitrates levels are the resultant of the balance/imbalance of the import/export function.
Firstly, you may want to set a realistic target for nitrate, mine is 5ppm to 10 ppm, started at 40 ppm when the tank was young. I started with the recommended amount from Red Sea, and then tested once per week. I increased the dose by only 1ml and then tested. If it dropped I maintained this dose until it stopped decreasing, then if not in target, again increased by 1ml. At the same time my load was increasing as I was adding fish, so I added another 1 ml. I kept doing this for about 6 months until one time, I got to target of 5ppm and it stayed there. In the end, I started at 5ml and today I do 12ml. This dose has not changed now in a year and testing I only do monthly or so. Once Imwent to 13ml and nitrate went to zero, so back to 12ml.
As with anything in this hobby, slow small changes is best, test and retest.
Make sure your skimmer is running 24-7.
I hope this might help you, carbon dosing is important to me as I run no sump, my export abilities without carbon dosing are limited.
Yet I am extremely pleased with the results.
Your post talks about low dose OK. I would say the dose should equal what is needed to,maintain a normal nitrate range...(I keep corals)....again for me anything under 10ppm is fine, but zero is not.
For algae issues Phophates and light have the greatest impact and while I do see NoPox lowering phosphates, the impact is much lower.....for this I use Lanthium Chloride and Rowa.....if you maintain phosphates at say .02-.04 ish, have a photoperiod around 8-9 hours, do water changes and remove with a brush, over time, algae will die, it will change from strong and green to pale and easy to remove. The bad thing about this process us that it takes time, the good thing is once there, if water stays consistent, it does not return. You can chemically treat fast, but it just comes back.