I have 3 plant filters in my hall pond, the water from the pond goes up through small rocks and the bare roots of some philodendron and pothos. It works great at cleaning the water of fish poo and other organics. However, I have cichlids in that pond and they just don't create enough fertilizer for the plants to do really well. Also, of course, it is harder because they have no soil.
I want to try foliar feeding them but I've never done it and don't know if I can use regular fertilizer like Miracle Grow? I'm trying to avoid adding too much fertilizer to the pond water. Can I dilute dissolvable fertilizer and just spray it on the leaves regularly? Any other advice?
Here's a pic of one of the filter boxes from my phone.
