Congrats-Sump tanks IMO get very crystal clear water, the trade off is the CO2 loss.
Soil wise ADA is not the most expensive but cheaper versions of it works differently/not as well theoretically. [those with same size granules have lower ion/gas exchange theoretically] Maybe Roland[Lorba] can help you get a good deal! Ahem!
You can opt for sand + base fert setup. Base fert can be expensive but you only need to layer it as a percentage of the substrate. Typically 20 to 30% of the total height.
The sump you can put the CO2 reactor in here. Keep the sump covered to reduce CO2 loss.
If you haven't make your tank, it's good to make a Durso attachment to the overflow to reduce [amazingly] the toilet flush sound!
The others are standard. CO2 bubble counter, all the check valves for the airline to prevent reverse flow, timer for lights + CO2 solenoid.
[ADA's stuff are aspirational. I'll get one piece every year as a self birthday present!]
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