Smell coming from tank?`

The water in my 90g established tank has over the past week started to smell no matter what I do. I've cleaned and changed the media in my canister, along with the tubes; scrubbed the glass walls with an algae brush; vacuumed the substrate extremely thoroughly; and changed the water every other day during this period. But for some reason this smell returns overnight. I'm positive there are no hidden dead bodies anywhere in the tank.

Could the cause be bacterial, and if so would an antibiotic help?

Thanks

brich999 said:

Carbon should get rid of the smell but what does it smell like? Id be concerned what is causing the smell. You havent used melafix or pimafix lately? When I clean my filters they smell like dirt but my water itsself has never smelled bad which is good since its rimless and about 4' from where I sleep. Last thing is have you changed food lately? Massivore is stinky and ive used other foods with garlic that smelled

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No melafix or pimafix. The food is Carnivore sticks - smaller version by the same manufacturer as Massivore. As for the driftwood, I have two large pieces in the tank, but I've had them for well over a year. why would the smell suddenly be in issue now if it was the wood?