Hello reef...
I keep plants that require only subdued light too and rarely dose fertilizers. You likely know this already, but aquarium plants need macro and micro nutrients. The macro or "large" dose nutrients, like nitrates, phosphates and sulfates are in most public water supplies. So, large, frequent water changes will maintain healthy levels of these nutrients. The micro or "trace" nutrients come from the fish. So, to get those in healthy amounts, you just need to have a reasonable number of fish in the tank and feed them a balanced diet.
Just a thought.
B