I have a 10g tank that I am trying to get a carpet of micro swords to grow in. Unfortunetly they seem to be melting and not doing so great. I thought it was just acclimating to the new tank, but it has been a month and they still look rather sickly.
20" Finnex Planted Plus LED light 3 inches above tank (8 hour photoperiod)
2" Eco-Complete substrate with root tabs
EI dosing Alternating Macros and Micros Monday through Saturday
50% water changes Sunday
API CO2 booster 2ml daily
The leaves seem to be yellowing and every day I find a few blades on the swords floating at the top of the tank like they just detached from their roots.
I thought with Excel and medium light from my LED I would be able to grow them, but they don't seem to be doing so well.
Post photos of the other plant that is yellowing. It may be a symptom of another problem. Though the fact that the micro-sword is low down to the substrate as you mentioned may very well explain the yellow appearance of the plant.
The plants are looking ok from what I can see (no obvious nutrient deficiencies). Lowering the lights closer to the tank (increasing the brightness) will probably help the micro swords grow more green.