If conditions are right, you better believe it! I got mine that way, and
now I have to throw net fulls of it away every 3 or 4 days. I like growing
plants, but this stuff is quickly becoming a pest. It will rob the light
from your bottom plants, and it can cause a major PH crash and suffocate
your fish if you inject CO2 and you don't stay on top of this stuff good
enough and let it take over the surface. I learned this the hard way too.

N8



"John H." wrote in message
...
I gots a few plants today at my lfs and I asked for a few duckweed, I never
saw it before and was surprised that it was
so small. So he gave me like 5 pieces for free. I've read posts that in a
few days this will overtake the surface? Will this happen to my tank given
such a small starting amount?
thanks