I have what looks like a large amount of dust swirling around in my tank. It looks crystal clear until I turn the light on, when whatever it is scatters the light and looks cloudy. This is looking along the long axis of the tank. I did a 30% water change today, which improved things slightly. I added a new fish recently, which looks to me like the cause. Am I right in assuming this will clear up over time?
Inhabitants of a Mirabello 30 (2 months old):
1 Calico Fantail
1 Black Moor
1 Chocolate Oranda
1 Golden Apple Snail
All inhabitants are happy and eating well. I feed them sinking pellets once a day. There are a couple of mid-sized plants in there, but I don't know what species.