I started growing duckweed about a month and half ago. I had 3/4 of the pool covered, then all of a sudden it started going backwards, till it nearly all died. I thought the problem was no direct sunlight. I put it in a 100 litre container in the full sun, it seemed to stabilise then just rolled over and died. I have some in my guppy ponds that is dark green, with very little growth. What do you think I am doing wrong?
Any ideas will be much appreciated.