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Hi, I live in Auckland New Zealand and have a 300 litre aqarium which has been in action now for nearly 18 months. The problem I have is my sword plants have developed black spots. Is there any remedy for this. Kind Regards. Wellmax
Do the black spots develop to the point where they become holes (pinholes) in the leaf? If so, that sounds like a potassium deficiency. If they are just black spots that stay as black spots...hmm...I have no idea.
Here's a link that helped me figure out some things with my plants. As JohnPaul said, it could be potassium or phosphate deficiency. There is also a black looking algae that "spots" leaves. This article calls it hard green dot algae. I'll see if I can find other info.