First grow in Autopots and Coco (Mephisto Sour Stomper & Strawberry Nuggets x SOH)

Both plants are finished with stretching and are now beginning to bulk up. I started mixing in green sensation into the res. Idk if this is a common problem but my autopot reservoir began to smell a bit moldy. I have a circulation pump running for 15 minutes each hour and started using athena cleanse. But still I have this moldy smell after some time in my res. So last time I filled in new water I did clean the tank and the pump completely with some h2o2. I hope this helps and its enough to do a complete clean like every 4 weeks or so.