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Brown Spots!

4K views 6 replies 3 participants last post by  Byron 
#1 ·
Hi all,
some of my plants are getting small brown spots on their leaves and I was wondering what the heck they are and if i can get them off. They are not killing the plant but remain very unattractive. :-?
If you want to see the plant it's on the far corner.
<http://www.fishtanks.net/fishtank.php?fishtank=2488>
 
#2 ·
If the plant in question is the one in the back left corner, that is a sword, Echinodorus bleherae. If the brown spots are the two just visible on two of the leaves, that is a nutrient deficiency.

What fertilizers are you using, and how often?

Byron.
 
#5 ·
The only fertilizer I am using and have ever used is flourish comprehensive. It is the one in the front right corner tho and all my other plants are doing very well.
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I can't see the plant clearly enough in the photo to detect any spots. As for the sword I mentinoed, I wouldn't worry about those two small spots, they are nutrient-related and I see similar on some of mine from time to time. If they increase, mention it and I'll comment further, but for now the Flourish Comp is fine. A clear close-up of the front Ludwigia might allow me to see something.
 
#7 ·
I was using Flourish Comp twice weekly. But one must remember that I have very soft water, so calcium, magnesium, sulphur which occur in most medium/hard tap water is totally missing in mine. I am now done to once a week, as I am experimenting a bit.

The tank with Flourite substrate is noticeably getting brush algae. This is a bit odd, as both Flourite and Eco-complete manufacturers claim this will not occur. As of this week, I am not fertilizing with liquid in this tank.

I am also trying magnesium sulfate (Epsom Salt, which is pure magnesium and sulphur) in two other tanks and this does seem to have had good results in now 3 weeks. Flourish only once in these tanks too. Back in the 1980's, with similar very soft water, I only used Epsom Salt [this was suggested in the plant column in FAMA back then] and had very good plant growth with less light than I now use and no other ferts. One has to be careful not to overdose magnesium, as this causes iron deficiency and other problems.
 
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