Hello everyone I've just purchased a aeros 1v master DWC system and this will be my 1st hydro system I've used I know how to set it all up but I need help with how much water to put into the centre tank and once I've tested the ph do I continue to test until I renew the water/nutrition in the tank if so is it just a case of addin ph up or down to the water tank. Thanks for reading and answers will be much appreciated