Based on the description and photos you've provided, it appears that the white fuzz on your aquarium plants might be a bacterial growth. This type of issue can be relatively common in aquariums, especially when there is an imbalance in water parameters or other environmental factors. One possible treatment for this type of bacterial growth is using hydrogen peroxide (H2O2). Hydrogen peroxide can be an effective solution, as it helps to kill off the bacteria without harming your plants or fish when used correctly
