I thought they get yellow from low iron? Mine go brown because of aphids,
or if they are right underneath my eheim fertilizer doser.
"cindy" wrote in message
m...
I put a few things of frogbit in my tank 2 weeks ago. I've read on
this message board that it is a good way to monitor iron levels. They
have looked healthy - but recently the edges or tips of the leaves
have begun to turn brown. Do you think this indicates low iron?

TIA,
cindy