looking very good mate, as always.
To clean them for reuse i recommend to soak the used ones and brush off all thats on it. Let them dry out well over some days or weeks and then soak with the new starter nutes as always.
To prevent mold on the remaining biomatter, one can spray some h202 or pyrolyt on it. I used pyrolit this time during the grow multiple times and it works like a charm. But eventually i will go back to h202, simply because it is cheaper over time. I think a cheap bottle of vodka would do as well - i already tested successfully isopropanol. Any of them work and if you apply after watering, it stays longer on and keeps superficial. No need to go into the pyramid, as your and my tests already showed nicely that the inner of the pyramids keep very clean.
How is your covering working? Any changes to airpruning seen? That's a good way to prevent mold on the pyramids? How does the rh behave, i guess it stays a little lower due to lesser vaporation?
Greetings to the other side of the world my friend!