I was curious as to what the fertilizer ratio was in my potting soil, so I pulled the bag out and I was surprised to see it was 0.07-0.01-0.03. Could this be a reason I'm seeing decaying/brown leaves? Could my potassium/phosphates be too low? Should I start dosing it?
It was the cheap expert gardener stuff from Walmart.... I knew I shoulda went with Miracle Gro :\
For soil, that is fine. Remember, this is not a dry fertilizer that you put in the tank in tiny quantities. There is a lot of soil in the tank, and the plant roots are in direct contact with it.
Ok. I'm wondering why I'm seeing some browning/necrosos of leaves, both older and newer, around the edges. As well as some green spot algae and an unknown algae on my swords?
Here are some pictures:
Tons of roots dropping into the water column, green spot algae visible:
How long has the soil been in the tank. You can get nutrient deficiencies with soil particularly with new plants or in the first few weeks of adding soil. The plants need time to grow good rooting systems. Since there are very few dissolved nutrients in the water column you can often see deficiency, especially with plants like anubias (nitrogen or PO4 deficiency, sometimes K as well).
Nutrient Deficiency From Cheap Potting Soil? 
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