It was a mini crash, I lost coup torches, one hammer, one acan, couple mushrooms and this big beautiful duncan
. Couple theories, one is I started using a new return pump with one section of new pvc pipe and might be the glue is not dried before I used it. The other was that I had a new brute trash can for RODI and might be I didn't clean it good enough. Or bad design in my floating valve system that supposed to stop the flow when full but could leak unfiltered water to main reservoir. Basically, I have no idea. I reverted all those changes back and now the rest are doing OK I think.