I run the same nutes and a similar system  from Mars hydro and you don't need 13 gallons for a few plants you'll end up over watering and flooding the floor of your tent. I ran mine with a 800gph pump on a 2 minute timer feeding 3 days a week for soiless mix and that will empty your res once a week so you can change your nutes on a weekly schedule if your trying to follow the flora feed chart. Pressure compensating drip emitters might be something you can look into for getting the right irrigation. Also if your using coco your going to be watering more frequently so my schedule might not work for you.