IMO/IME DSM is great way to start.
High CO2 levels free
You can max the lights 12hrs a day max intensity with out algae issues
Easy to plant esp HC without water. Then it doesn't float up when you flood as will have good roots.
Fewer plants needed to start with also.
Choosing HC for your first high tech tank is brave IMO 😉
+2 for DSM
With a DSM, the plant has the advantage that it can put all energy into root development.
And when the tank is flooded, the plant only has to worry about transmission to submersed.
Plus when you flood the substrate has cycled and the plant has lots of energy store so it manages the transition easier
Drystart has many advantages, not only maturing plants it also biologicaly pre matures the substrate with bacterial life.Depending on how its planted it can prevent substrate sliding because the plantroots keep it in place.
I don't want to start a fight on DSM and its benefits [or not]. This has certainly happened already - lol. Truth is I am not a multi-year experienced aquascaper. This said one doesn't need to be an agronomist either although I do have some experience with plants. This far I fail to see the real compelling benefits that DSM offer over the standard flooded method. I will quote the benefits that were stated before and give my comments on them. Don't get worked up, it's just my opinion:
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High levels of Co2: yes and so does a flooded tank. One can inject high levels of Co2 at the beginning considering there shouldn't be any fish in the tank. Co2 is not exactly expensive, granted it's not free, still this is not a compelling advantage over a flooded tank.
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Ease of planting and no floats: well this I can partially agree. If you plant your HC properly and add water properly there is not reason the HC should float. It should be minimal.
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Fewer plants needed: well that's debatable and in my personal opinion not a benefit that outweighs starting flooded. How much are talking here 3/4 euros a pot of HC?
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Root development in DSM: Perhaps but then again after flooding the tank the plant will go into shock and partially melt. If you have healthy plants from the beginning, they should be fine and develop healthy root in a flooded environment as well.
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Cycled substrate after flooding or biologicaly pre matures the substrate: this one made my eyes open wide. The substrate will be cycled no matter what method you chose. The downside of a DSM is that you are not using a filter until flooded so that canister will not be cycled. Yes you might have plenty of bacteria in the substrate already (depending on how much substrate you have) but if you are planning on having a bio filter and will be relying on it as a bio filter then flooding from the beginning will cycle your canister as well and is most advisable.
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Substrate sliding: well I think this is just wrong. Substrate should be properly retained from the beginning, DMS or not. Relying on root systems to retain substrate is a gamble that shouldn't be taken. Plus even having a heavily planted tank with plants that shoot heavy roots does not completely prevent substrate sliding. Unless your tank is in dry mode for many months sliding will occur to a certain degree specially if using HC as it does not produce a deep and strong root system.
Now these are my comment for a no go for DSM:
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Time: the time you spend with a DSM is time basically wasted. Twofold: 1- plants will melt to as certain degree after flooding. 2- it delays your understanding of how your tank works. Once flooded your tank and plants will behave differently. You will have to adapt again. Flooding the tank from the beginning gives you the possibility of see things evolve and take corrective actions.
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Algae: possibility of having high concentrations of algae development on the soil. Being in DSM makes it very difficult to combat this compared to a flooded tank. Plus after flooding with a DSM you might have some plan melt with high levels of organic compound in the water. Considering you do not have a cycled filter yet the filter will merely be a mechanical filter. Unless you are experienced you will need to wait again some time (perhaps not that much) before adding fish. Your substrate alone might no be enough to cope with the ammonia/nitrites/nitrate. It all depends though.
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Mold: this is perhaps one of the major issues. A highly humid environment will see mold development with the potential of killing the plants.
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Humidity: you need to keep a constant eye on the humidity levels to prevent the algae/mold development. A bit of a pita considering a DSM can take several months before flooding.
The only "benefit" from a DSM I see is if you want to make extensive carpets and use mosses. Still I don't see it as a compelling reason to start a DSM.
Don't shoot me please!
