The nutes that come with ti are very favorable to what most recommend. The b loom is just a little lite on the Nitrogen, but everybody seems to recommend backing off N after a very short while. Just make sure you wait until your plants get to 6-8" before adding nutes and only do 75% the first time.
Also, forget the drain. Went to Home Depot today and got some 1/2" tubing and just pumped it out. Very easy...only $6.
Get the best lights Dual Spectrum II...Use distilled water...change it every 10-14 days...watch your ph 5.75-6.25...Mix your nutes in one of the gallon jugs and micro in another before adding to the tub. Let it sit overnite and make sure it is totally dissolved.
Good luck.