Fluorite Leaf

Do snails harm live aquatic plants?
Some of my plants are dieing and on the same day, I saw a lot of snails in the tank.
The plants get 3 watts per gallon, Fluorite Substrate, CO2, Flourish and Flourish Excel.
Can over-fertilizing kill the plants?
I've also noticed a reddish-brown, hair-like substance growing on the leaf of my Amazon Sword Plant. What is it?
And some of the leaves of my Hygrophila Difformis (Water Wisteria) are turning yellowish-brown. Are these snail eggs or something? What is it?
It's a plants only tank. No fish and other living things except plants and snails.
Certain species of snail will make a meal out of live plants however most snails which come on the plants as eggs are pretty much harmless.
Over-fertilization won't harm the plants however it will encourage unwanted algae growth. Refer to the instructions on the fertilizer packaging for dosage information.
Yellowing of the leaves indicates a mineral deficiency, namely Iron and Manganese.
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