I have almost the same exact set-up your using now, I connected a drip system to the water pump in the res so i only put ten gallons of water in the res to begin with. I have 6 plants in a 25 gallon tub. I cut 6 holes in the top and put the net pots in the holes, run the drip pipe around the tote and run it 24/7. This will keep the plants oxygenated and feeding the entire time. I would def use 2 air stones especially if you fill the tote up all the way. You really dont need more then ten gals in there especially if your only doing 6 plants like i am. I used fox farm as well when i first started and i hate to tell you but i would get rid of them ASAP. In hydroponics the FF line will make the ph fluctuate CRAZY. Ive used 5 different lines of nutrients since ive started and FF is by far the biggest pain in the ass. I thought FF was the end all be all of hydro nutes until i actually used them. I would go with Advanced Nutrients PH Perfect series or General Hydroponics 3 part. Advanced nutrients did there thing with this PH perfect technology, once you add the nutrients it will bring your water to an even 5.8 ph and it will stay there. GH 3 part has a PH buffer that makes it easy to maintain constant ph. I personally use GH 3 part but i will be switching to advanced nutrients when i get the money. As a rule of thumb ALWAYS START WITH A 1/4 STRENGTH NUTRIENTS SO YOU DONT BURN THE PLANTS. It is almost impossibl to under feed in a hydro system but VERY easy to over feed and burn the leaves. Once this happens it could ruin a crop, so if your nutes call for 2tsp per gallon i would do 1/2 tsp per gallon. Trust me when i tell you that if you follow the feeding schedules on the bottles then you will burn the plants no doubt about it. Advanced NUtrients is the only line you can follow the feeding schedule exact becasue they are the only company who specifically makes nutrients for marijuana.
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These are some pics of the start of my grow and where im at now. Does my set-up look anything like that you have going on?