Small Stealth Desk Grow

Trying to make a cheap small stealth grow in my computer desk side cupboard. The cupboard is: 35cm wide, 45cm high and 45cm deep. With the drawer above holding the 300w LED light. I have knocked out the back of the drawer and added a USB computer fan to help cool the LED Light. I made a custom box to put into the cupboard out of reflective material just using a glue gun and some Velcro to hold it together. The seed went into a glass of normal tap water on the evening of 06/12/2018 then left in a warm cupboard. It germinated by the morning of 09/12/2018. I then transferred it into a pot filled with Cocolite 22. The pot was simply the bottom of a soda bottle with some holes in the bottom to drain water out of. The big bottle in the cupboard just has water in it. The tap water at the moment is very cold and to avoid shocking the roots i have placed the water bottle in the cupboard with it. The power draw from the 300w Kingbo LED Light: Veg (Blue Light) 54.4W Bloom (Red Light) 65.1W Both on(Purple Light) 119W These Watt do constantly vary by 1 or 2 Watts. I plan to just use the Blue light on 18 hours a day for the Vegetation period, then both on for 12 hours a day for the flowering period. The Nutrients ill be using are: Canna Coco A and B Cal Mag