Re:Water Sprite turning red?

Hi Everyone,

Just a quick observation... 

I have a couple of "floating islands" of Water Sprite, Ceratopteris
cornuta, growing in my main tank, and it is doing very well, with huge
"antler-like" fronds growing entirely emersed. I've noticed that a few days
after the new fronds unfurl, they are "tanning", i.e. turning a rusty
reddish color. The do not appear to be burnt by the light/heat from the
overhead metal halides, and I've never seen this before so I guess it may
be a reaction to the light.

Anyone else experience this?

James Purchase
jpp at inforamp_net