Alex123

Ok, I am curious if this is common. I have two small aquarium in my room which are mostly covered to avoid evaporation. I also have a water pump with no filters for circulation. My tanks are heavily planted and I have duckweed covering the entire surface. Since I have hardly any algae, the duckweed are growing like crazy and my room started to have this plant/weed smell. It's still cold so the windows are closed. I wonder if this is common. I probably need to remove quarter duckweed periodically.