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Re: Plants turning brown.??

Actually, the browning is not a coating.  Its seems to have started along the 
edges and progresses to the center of the leaves.  Their isn't any brown algae 
growth anywhere in the tank, just very small areas of green.

Date: Thu, 15 Jan 1998 06:15:15 -0500
From: krombhol at teclink_net (Paul Krombholz) 
Subject: Re:Plants turning brown??
Boris Kaushansky wrote, Jan. 13:
.........Here's the problem though, the older leaves on ALL the plants have 
>>      what appears to be a brown coating or maybe they lost their entire
>>      green coloring for the brown.  They leaves never went through a yellow 
>>      stage just green to brown.  It appears as though they are
>>      deteriorating.  The new leaves on the other hand, are vibrant green. 
>>      Oh, the tank has 2 20W tubes, triton and trichromatic, additionally 
>>      their is no glass to and bulbs are 2" above the surface of the water.
It is important that you try to distinguish whether the leaves have a brown 
coating or whether they have actually turned brown.  If it is a brown 
coating, then it may be caused by a mix of algae types including diatoms 
that are a golden brown color.  On the other hand, it may be a heavy 
deposit of iron compounds that were solubilized in the substrate and then 
deposited on the leaves.  If this is happening, you should also get a 
deposit on the glass.  .
Paul Krombholz, in soggy, rainy central Mississippi