Now to deal with your current problem wash out the res real good, lid and everything with a 8% h2o2/h2o mix. Wash out all the lines and pumps and any thing else that touches the res water at any time. Do not rinse it out after applying the mix. Get a spray bottle and use temp adjusted water and spray the root boogers off the roots as well as you can, being careful not to get any root booger material near the sanitized res. After you do this make a new solution of 3% h2o2/h2o and respray down your roots, and not rinsing them. I would also run the rez for an hour with a 3% solution with the plants in it. What you really need to do is make the environment for the boogers uninhabitable, by dropping the temps in the rez.