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Rex was referring to your plant bulb. The fact of the matter is that you don't have enough light to make the plants need any nutrients beyond what the fish+fishfood put into the water. Even then you might have too much nutrients in the water with this little light...especially if you've ogt fast growing stem plants like Hygros.

You'd need to add at least two more 40w fluorescent tubes (assuming that your light fixture has a single 40w tube in it) to get you up to the 2wpg mark, which is pretty much where you need to be to grow most plants in your 55.

Adding CO2 will also aid in plant growth, but it's all a balancing act (between light, CO2, and nutrients) that takes time to get a feel for.
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