I had to recently replace my Fluval Aquaclear 70 with a new one. I put 2 of the old media and one new media in the new filter. Now my water is cloudy. Ammonia is 0, Nitrites are 0, but Nitrates are in between 20 and 40 according to the API color chart I have. I use the master kit with drops. What should I do? is this just a bacteria bloom? How could this be if ammonia and nitrites are 0? Will Nitrates this high cause harm to my fish? I did recently lower water temp from 74 to 72. I recently got a heater (Cobalt Neotherm) for the first time and 74 was a little too warm. Any answers to my questions and advice are greatly appreciated.
Thank you
Thank you