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Photos by Alan Montour - Click to enlarge
March 15, 2003
Today I have changed 50% of the water in this tank. The "white film" was severe and even appearing on the leaf surfaces. I even tried to gently rinse this off with fresh water after the exchange and a light film remains. Bubbles formed with this film were even hard to pop! It seems almost like a waxy substance and is very odd indeed. I do not know if this may be oxidation from the tanks -- aluminum construction and my well water combined with the "cocktail" supplement. Very strange indeed!
There may be several things involved here. When we first
started using our stock tanks, there was indeed a film on the
surface of the water that we attributed to their construction.
It went away in time. With adult plants we often see the grainy
white "crust" (just like your images) on leaves in
dry periods. Though we wash them with pond water and city water,
the only thing that seems to dissolve it is rain. We still don't
understand or experience the bubbles.
March 16th, 2003 Emergency!
What a shame! Could your replacement water or leaf rinsing water have been a substantially different temperature than what was in the tank, either warmer or colder? Examining the shriveled areas, did the leaves dry at all when you were changing the water? When outer areas dry the inner parts tend to sink into the water and can go dark like yours. You are likely to lose these leaves sooner than normal but the plants will probably be OK if the underwater leaves were not affected.
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