Discus tank odor problem solver

[Frost]

Driftwood can definitely funk things up. Boiling it before adding helps, but if it's been in there a while, might be time to replace it. Also, consider adding activated carbon to your filter for a week or two to absorb odors.

[Lido]

Man, I hate tank smells. Had a similar vibe last summer. Turned out my filter intake was clogged, so flow was weak. Cleaned that, added an airstone, and boom—smell gone. Maybe check your FX6 intake too?

[Darego]

Airstones help a lot with gas exchange. If you don't have one, grab a cheap one and see if it makes a difference. Also, how's your surface agitation? Low oxygen can make things smell worse.