@BoomBoom thank you!! I thought about doing exactly these steps after gathering some infos on the web :) It reassures me a lot to read your comment and to see that I’m thinking in a good way 👌🏼
I just adjusted my lamp to 50% (75% previously, Lumatek ATS 240 W Pro), flushed everything and renewed the soup with only tap water. I’ll check in 24hrs the results ;)