Pump – leave the pump on 24/7 – the roots need constant access to nutrient solution and oxygen.
Transplanting – Young plants started in 1” rockwool cubes, root riots or jiffy’s can be transplanted into the Amazon.
Like NFT, they must be root bound before they go into the system.
Plants under lights will take up water at a greater rate than they take up nutrient.
Over time the EC of the solution will rise.
Top up the tank with half strength nutrient solution, check EC and add extra nutrient if required.
Then adjust pH level and perform a solution change every 2-3 weeks to maintain the pH and EC balanced.