It does look like duckweed. However, dwarf sag really has nothing to do with it unless the duckweed hitch hiked on it.
That doesn't make any sense. 4 out of the 10 tanks I have are planted with Dwarf Sag among other plants. However, the ones with the Sag all have that at the top of the tank. The ones without it have none of what appears to be Duckweed floating. Super odd....
Duckweed and dwarf sag really have no relation unless there were a couple pieces of duckweed on the dwarf sag when you got it - which is very likely. It is very easy for a piece or two to go unnoticed and then explode over the whole tank.
Duckweed and dwarf sag really have no relation unless there were a couple pieces of duckweed on the dwarf sag when you got it - which is very likely. It is very easy for a piece or two to go unnoticed and then explode over the whole tank.