Re:Iron

[Paul Krombholz <krombhol at teclink_net>]

Small floating plants of Ceratopteris are good for measuring iron 
availability.  Pale new growth where the older leaves are greener is 
the sign of deficiency.  Some plants are better than water sprite at 
getting iron. Floating Bacopa monnieri and Anubias show no deficiency 
in the same tank where Ceratopteris shows deficiency.
-- 
Paul Krombholz in stormy central Mississippi, with wind and hail 
damage, flooded roads and currently under the second tornado warning 
of the day.