First off 6.5 is way too high. 5.8 is the target pH range for hydroponics regardless of what you have read on this site its 5.8!!! Now you have no idea what nutrients you are using either.... thats not very good and could cause you more probs.. the kit you bought on ebay is simply a rubbermaid from walmart that costs $5 with holes cut in the top(free you can do it yourself with exacto knife) drill one small hole on the side and pop airline in with an airstone attached plug it into an airpump and your done.... not sure what you mean you're not mechanically inclined?

You could have used the money you wasted on that to buy yourself some real nutrients. I would recommend General Hydroponics Nutrients for you as they are the easiest to use and give excellent results, also the most popular hydroponics nutes out there they sell them as FloraGrow FloraBloom and FloraMicro all you need to buy is the flora micro and flora bloom you dont need the grow and you can use what is called the "Lucas Formula" its a very popular feeding scheduale growers use. The Lucas formula is this

G-M-B(Grow-Micro-Bloom)
Veg(ml/g) 0-5-10
Flower(ml/g) 0-8-6

So for each gallon if you are vegging you add 5mls of micro and 10mls of bloom.. So if you had an 8 gal res and were vegging u would add 40ml(5ml x 8gallons) Micro and 80ml(10ml x 8gallons) Bloom. Very simple to use and very very very very effective.

Don't use the ph down and up together in the same res either. How often are you adjusting ph? Also do you have your timer on your pump or is that timer for your light? If you want to get better at this and learn I suggest you listen to me a lot of these people helping you are first time growers themselves leading you in the wrong direction.... this site isnt the greatest for cannabis growing help btw too.