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So I've seen lots of bubbling from my substrate and I figure I have some denitration going on in the deep layer as after water changes I smell a bit of sulfide, so I figure I've got some anaerobic bacteria down there. From what I've read this can only be a good thing but wondering what you guys think. Especially about the sulfide smell. Doesn't get too bad and settles a day or two after the water change. I currently do weekly 50% changes, don't really have time for anything more frequent. Substrate is byron white approx 6-7 cm deep. Thoughts?