I have it in my tanks and it grows like crazy. I am using an Aquaclear50 on my 29, a Whisper 40 HOB
on my 10g, and an Aqueon Quiet Flow 20 on my 5g. All of them run at full flow. The water lettuce completely covers the tanks. I am using 6500 k
CFL bulbs. I had to make a coral around the filter outflow to keep the water lettuce away from it or my water couldn't circulate.