Ok, first of all, for coffee you are going to have patience. Everything with Coffee is slow. You can grow it indoors under good, warm light but with a 200w Sunblaster I cannot imagine it doing that much. Coffee does better when not grown in direct sun so it doesn't need a blasting 1000w, but I would suggest a 400w HPS at least. Would it survive under the Sunblaster? Yes, but it will most likely grow 4x slower than it already is going to.
It takes between 2.5 to 6 months to germinate a Coffee bean, depending on who and where you got your seed from, if it was a recent crop or not, if you have a cherry versus a fermented and dried bean, etc. You say you have them planted so I would just wait patiently for them to pop up. You need pretty well draining soil. I use Pro-Mix BX for everything since it drains really well and I can add other stuff like Coco coir if I need it to retain more moisture. I suggest that. Go and get a Hydrofarm Seedling germination mat to warm your pots/media and to speed up that germination.
When your seedlings sprout, keep the soil more on the drier side. If you were to fill it to the point of it being max capacity and running off, try to keep the medium at about 60% of that weight or less, but not completely dry. If you prepare your medium with earthworm castings and humates and amend to ph of between 5.0 and 6.0 you should be pretty good to just water it the rest of the year until it gets bigger and needs additional nutrients. When you get root strikes on a 4" pot, you should transplant to a 10 gallon container (really, a 20 gallon container. It's a tree.) so you don't have to move it again and feed it with about 1000ppm of nutrients which should last through that year. Outdoor they need 3 feet depth for roots. Indoor you really should use a Smart Pot to get self terminating roots that make a nice solid rootball to put into the 10 gallon planter.
Irrigate uniformly over 7-9 months and then stop watering except if the plant looks like it will die for 2-3 months. This dry stress period is extremely necessary to ensuring a good flowering period. For the Kona Coffee to get the total appeal you should purchase and crush up some Hawaiian volcanic pumice for the micronutrients and terroir it will produce in your coffee plant, and foliar mist it often. Think of it this way, how is it supposed to taste like Hawaiian Kona if it is grown on the opposite side of the world in Canada? You feed your soil. The plant is an indicator of how good the soil is. Sometimes, plants need really crappy soil to survive and by giving it everything you THINK it needs you actually kill it off. Coffee is not like Cannabis. It is mostly a set it and forget it kind of plant.
Does not tolerate frost. Needs temperatures between 20 and 24C (68 to 75F) for optimum growth. Arabica requires an elevation of at least 1000m above sea level and it appears most of BC is above 2000m. If you can keep the coffee plant at the lower end of the temperature spectrum you will achieve a slower but much more cuppable, palatable bean. Colder and Bolder.
It's a little challenging but a fun plant. You can expect to produce about 2 ounces of coffee per season perhaps. Fully grown outdoor trees can produce 6 ounces per season.
I have only grow a couple but I own a coffee shop!
