You can use Aquasoil only, or Aquasoil with Powersand. The latter is reported to have better results, but it may just be a placebo effect. You don't need base fert for ADA.
Aquasoil breaks down into a muddy mess over time (lasts about 1 year under normal general usage). The muddy mess tends to start getting BGA. However, most users of Aquasoil either do a tank overhaul often enough to not see the Aquasoil becoming mud, or do not disturb the substrate at all such that the Aquasoil stays solid for as long as possible.
I can't help you on Dennerle because I've never used it.









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Seems like Red Sea substrate provides a high buffer as it allows the tank to be more stabilize.




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