What does iron do for plants?
I have had a 20 gallon planted tank for about 2 years now. I don't have any "hard plants" in that tank just an ozelot sword, dwarf sag, and red jungle val. I am running 2 bulbs a 5000k 100 watt cfl and a 5000k 64 watt cfl. As for substrate, I have eco complete and Iuse osmocote root tabs. I run no co2, but I have 0 algae. Here is my problem. Ever since about 4 months ago, my plants just stopped growing. The dwarf sag I replanted in another part of the aquarium is still green but has not spread. Same with the jungle val. So, I have come to a conclusion. I need co2 or i need some iron. SO, heres my question what does iron do for the plants and will it improve my situation.