Good morning, we have recently added a Jack Dempsey to our tank and now there has been a weird smell coming from the tank. We have mainly cichlids in the tank and one Bristlenose. We have cleaned the tank and even paid a professional to clean it and the smell seems to leave but after a few days it returns. I just want to make sure this isn’t some sort of sign that the fish are having issues or the tank needs more frequent care. Any suggestion?
Thank you
Thank you