First and foremost, the amount of surface agitation or circulation in a planted tank largely depends on the species of plants. Some plants can't handle it, other plants can't live without it. Another determining factor is location of the plants vs the output from the filter where the strongest amount of flow will come.
I have a house full of planted tanks, all run hang on filters except my 29 gallon biocube which runs a sump system in the back & 75 gallon with canister,. You can check out the photos in my aquariums section by clicking on my name. And yes, I do run carbon in some of my filters, others I have only biomedia in them.
And you are correct about plants consuming O2 during dark hours. Again, the amount they consume/use depends on the species of plant, temp of the water, amount of light during the day, how healthy the plants are, what other nutrients they are taking in, and water chemistry.
Have you yet run this tank during dark hours without a filter? If so, what kind of results have you had thus far and how long has that gone on? If you've done it successfully long term, I would say if its not broke, don't try to fix it. If you either haven't done it yet or have seen a decline in conditions in your tank, then I would say there is no reason not to give it a try if you are keeping plants that can handle it, and as long as delicate plants are not caught directly in the water flow from the filter. Some filters have a stronger outflow than others... that should also be taken into account.
Based on the tank info in your signature, you have a 30 gallon breeder tank. (this is calculating dimensions listed.. and so you have the proper info in the future 30 gallon [US, liquid] = 113.562 353 52 liter)
For the plants you are keeping, if you desired to run a hang on filter just for oxygenation purposes, work with something rated for a 10 - 20 gallon tank, not 30 gallons. This will greatly cut the water flow for those plants that are more vulnerable to the outflow pressure, and be sure the filter is in a location so it is not putting water flow directly on the plants. This may take some time and a bit of experimenting, but shouldn't be too difficult to achieve.