Sorry I haven't posted earlier, but I only just picked up on this thread now. Did you happen to answer HighSeq's question at the start of the thread ? I dont seem to be able to find the response - he made some excellent points.
I've done several "regular" Aquasoil tanks now and have the following advice....
1, ADA don't distinguish between their soils (except that the PowerSand - which is clearly a base substrate). Its the same process. Did you happen to use any of ADA's biological boosters (Bacter100 etc??). This will start the cycling process. If you didn't, don't worry about it. You aren't going to have any fish in there anyway from what I can tell.
2, In response to your question about .... "My macros are premixed. Can I just use gh booster for the K? If so How much?" GH booster doesn't provide Pottassium typically. You will need a specific KaSO3 supplement - though most blended liquid supplements are ok to get you started.
3, Don't worry about kH for the first 2-3 months. It doesn't matter with Aquasoil how much you try to boost the kH, it will still decline to virtually nothing in a few days. about 6 weeks to exhaust this behaviour if you actively add some form of Alkaline buffer. If you leave it, then it could take 4-6 months. Aquasoil (regardless of type) is all about plants and that means slightly acid, soft water. There is no point in fighting it.
4, If you are using medium-high lighting and CO2 then you will have to dose. Aquasoil has some nutrient in the substrate, but if you don't dose I can almost guarantee that you will have a blue-green algae outbreak. Also make sure you stack the tank full of plants (fast growers are the priority - you should hold off on the slow growers until the tank settles, otherwise they will be smothered). Just about every (professional) video you watch using Aquasoil ends up with quite a densely packed tank.
5, Do a 50% water change at day 3 and then 50% each week for the next month. If you get a BGA outbreak, turn off the lights and cover up the tank for a week. This will kill it off - your plants should be largely fine (crypts will melt - they always melt ....sigh). After month 2 you can bring it down to 25% each week (or 50% every two weeks).
6, I don't EI dose when setting up a new tank. I cheat and use the Seachem pre-mixed stuff (Excel Flourish, micros etc). After the tank has settled and everything is behaving itself (about month 4), then I do EI - primarily because it is way too expensive to keep using the pre-mixed stuff in the long term. I use this EI dosing calculator to start with and then adjust as I watch the plants behaviour - https://www.thenutrientcompany.com/a...ei_calculator/