The yellowing looks like iron or nitrogen deficiency. Are you dosing any fertiliser? What are your water parameters? Particularly nitrate.
How long are your lights on for?
Plants get their nitrogen from ammonia and nitrate in the water. The nitrogen cycle should be removing any ammonia that isnt taken up by the plants, but you want a decent nitrate level for healthy plant growth. While low nitrate is good for fish (zero is better), plants need nitrate.
Floating plants are huge nutrient absorbers. They are sat at the top of the aquarium with maximum light and access to atmospheric CO2 and to utilise that excess they need a ton of nutrients, which can leave a deficiency in other plants less able to take them up.
And the amount of light effects growth rate. More light leads to more growth, which requires more nutrients. If the nutrients aren't available then the growth is unhealthy. Counter intuitive, reducing the lighting will slow down growth rate which often results in healthier growth.
its all about finding a balance between nutrients, light and CO2. Without injected CO2, you can only adjust lighting and nutrients. Change the lighting period, see what effect that has over a couple of months. That way you know that any effect, good or bad, came from adjusting the lighting adjustment because thats all you changed. Then adjust the lighting informed by your previous change. Or change something else and see what effect that has over a couple of months. Maybe look at your nutrient dosing regime, or remove nutrient hungry plants. Not every plant will do well in every aquarium. Keep the ones that do well, get rid of the ones that don't. One thing at a time, see what happens over an extended period. Fiddle with things.
The fuzzyness looks like fungal growth from decomposing uneaten food.
