Yea, props for you for taking initiative and being vigilant. I’ve seen multiple times on here something like “I wasn’t checking my plant for a couple of days and then _____ happened”, which I get that life gets hectic, but unfortunately in those situations the lack of a watchful eye might have made the world of difference I could only imagine.
Your Hydroguard should be in soon I would hope, and that will definitely help the lower root issues. There are other options to combat browning of the roots, so I would keep an eye on the roots from here on out and if it becomes a big issue there are other fixes that the Champs can recommend here for you.
You know I’m kinda curious; I just got my Grobo about a month ago and I had to calibrate my pH pen like 10-12 days in to my grow as someone pointed out something in my plant… turns out it failed the health check and I had to re-calibrate it. That might be something to think about as well, probably can find the pH solutions at your hydroponic store for sure, maybe even at a pet store because of aquariums and stuff I would imagine. Keep that in mind cuz I wanted to believe my Grobo worked fine since It was brand new but that was not the case, if I didn’t check it I bet I would be running into some further issues now and my plant is bigger so it’s a pain in the ass already to try to lift the lid and do something like that… plus my holes for my pH and EC meter were too small, so I have them taped and hanging down in > . <
Also as far as the algae, I’ve seen more than once Champs saying on here to “scrape it off” so maybe you can go back in and scrape it off physically to be proactive without damaging too much of the Cocopod of course if you can help it