Hi friends. I need some advice and I’m not sure why there is some colour changes in my aquarium. It’s started like this. Last week, I did changed the water with 50% of water in. And it was ok and later, it changed to green in colour as I use the bacteria drops when I changed it. Moreover, 2 days before, I did changed the water. And it still changed to green in colour. Why is this changes happening ? Is this due to the bacteria drops or what?