What is your process when you fill your tank in hydro ?

Put water in. If mixing with different brand nutes I'd make sure the combos work together and be careful adding silca or carboload or bud candy needs to be mixed very well and some nutes when added can not mix together and form a slim in your water. So, water in, let it rest. Add nutes, pour your 20ml of nutes into 200ml of water then add mixed water into tank doing this will avoid any slim build up by adding pure nutes to straight water. And remember DWC takes 1/3 less nutes than a manual setup. Good luck.