My Aquarium Floating Plants are Dying 

Aquarium floating plants commonly die because of water current at the surface. Floating plants do not like water movement whatsoever and they prefer stagnant water flow. This is the number one reason why aquarium floating plants die on on people. The best way to get less flow at the surface of your aquarium is to use a sponge filter and have it turned down to as low as you can possibly go.
When it comes to aquarium floating plants your lighting is a big deal. You need adequate lighting between the spectrum 5000 K to 6500 K. This is why most normal aquarium LED plants are but you need to make sure that the brightness is adequate. This is sometimes referred to as the lumens on the LED light. Floating plants prefer brighter lighting.
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When setting up your aquarium light for your floating plants you should raise the light itself between 5 to 6 inches above the aquarium. This ensures that the ultraviolet light coming off of your life itself is spreading out to all the aquarium plants at the top of the surface. If you put your aquarium light on top of the glass lid and it’s too close to the aquarium water surface it will commonly burn your floating plants.
In the last important variable when trying to keep your plants alive he’s going to be water harness. The amount of total solve solids in your water can depict if you’re floating plan prefers that water or not. I have personally found that some plants will not grow in my water without removing some of that hardness. It is worth knowing this because if your plants are dying it may just be Something as simple as having to heart of water.