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Okay newbie here having trouble with conversions. Let me explain my set up first. I am using a recirculating system with Canna Aqua nutrients. I have a Hanna Combo Ph/EC/PPM Meter (the black one). I also have questions about adding my initial PPM from tap water. Here is what Canna says...

I have a platinum led grow light 450 model. It is an 11 x 19 inch light. I am going to be starting from seed and was wondering what height I should be placing my light during seedling growth and veg/flower. I will be lighting up a 3 x3 tray with probably 4 plants in it.

I have a few questions on the flood and drain system. I have 2 3x3 trays with my seeds going in rockwool cubes in a dome right now. Most have sprouted and are 1 inch tall. At what point do I introduce them into lighting. I will be using 2 platinum led 450s. I also want to know when to start...