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To start with you need more light. The "magic" expensive bulb you have in there doesn't make up for the lack of light. You have 40 watts over a 55 gallon tank. There are very few plants that can survive for long in those low light conditions. Adding nutrients doesn't help at all either, unless you have the light to drive the plants to use the nutrients then all you are do is feeding algae.

You did not say how long the tank has been set up but what you have sounds like diatom algae which is common in new tank setups and low light tanks.
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