why are my floating plants dying? yellow disintegrating dwarf water lettuce and spangles

I have linked the products that I use below.

Magic Erasers and the Magic Eraser Alternative ????
https://amzn.to/3VuhiIU
https://amzn.to/4cvQC0m

3 PCS Double-Sided Aquarium Fish Tank Algae Cleaning Brush:
https://amzn.to/497KRTV

RV Filter ????
Camco TastePURE RV Water Filter: https://amzn.to/3x8LPBY
Seachem Prime Fresh and Saltwater Conditioner: https://amzn.to/49eI37j

Seachem Flourish Excel ????
https://amzn.to/4crkZoV

Lighting ????
Finnex Stingray 2 Aquarium LED Light, Blue Fish Moonlights, 30": https://amzn.to/3PybjPD
Pawfly Aquarium LED Light: https://amzn.to/3J0m7SP

Substrate ????
Aqueon Plant and Shrimp Aquarium Substrate 5 Pounds: https://amzn.to/43wb90U
Seachem Fluorite Red Clay Gravel: https://amzn.to/3VzYbgD
Carib Sea Super Naturals Aquarium Sand: https://amzn.to/3VqEp7j
CaribSea Eco-Complete: https://amzn.to/3U1visL

Plant Holders ????
https://amzn.to/43uijTc

Filter & Filter Media ????
Tetra Whisper IQ Power Filter 45 Gallons, 215 GPH: https://amzn.to/3voRbsf
Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter (UGF): https://amzn.to/3PBbyJA
HuYaYa Pre-Filter Sponge: https://amzn.to/3PBbCsO
Fluval Zeo-Carb, Chemical Filter Media for Freshwater Aquariums: https://amzn.to/3TMohMb
AQUANEAT Replacement Canister Filter Pads (cut to size): https://amzn.to/3vlKQxT

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