on a serious note, res scrub down has begun. i don't know what's with silica but it sure seems to attract diatomes. so, to get back to a truly sterile condition, filled the res up with a very strong mix of bleach and water, and have the mixing pump running. once that's ran for 15 minutes, i'll run the feed pump to empty the res. that'll clean out at least the first major area of the system enough that any residuals in the plumbing to the tent will be flushed into the media and out. the h2o2 will take care of any unsavories as well.
literally my least favorite part about this system configuration. having larger equipment and better, more permanent plumbing would make this kind of maintenance a hell of a lot less labor intensive outside of the between grow changeovers.