Hi Laurent. OK on the test kit. If your skimmer is working that well maybe cutting back on the air will reduce the microbubbles? I'm just making guesses on that. I assume you're cleaning that white pad every day or two? That helps too. That turkey blasting is probably doing a good job of plugging up that pad. I replace mine about once a week or so with some similar stuff from the LFS that I cut to size. They eventually degrade and get pretty compacted & don't keep their porosity after a while.
50% water changes even after cycling? That sure doesn't sound right. That's an awful lot of water to be changing forever! I do about 4g every weekend.
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