All of a sudden I'm getting a fishy smell from my 3 year old tank. I do run carbon the same amount since inception and I change it every 30 days. All fish are accounted for. Any ideas what might be the cause?
Ah I figured it out! The water level in my overflow dropped a bit and all of the sponges and tubeworms that were growing above the dropped water level were starting to smell. I raised the level, problem solved.
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