Hey, so whenever I walk into my room with the aquarium, I notice a very strong fish smell that is not pleasant, but I don’t know why it’s occurring. My ammonia is 0, nitrites are 0, and nitrates are 5-10. I tested with the apI liquid test kit, and my tank has been cycled for about 2 years. The only thing that has changed is that I have added a fluval fx4, but I have not removed any of my old filters. I did have a very very small minI cycle after adding the filter, but that sorted out within 2 days. Could the new filter be causing a bacterial bloom, making my tank room smell? My room smells a lot worse than my tank also.