If you feed them a food with plant matter already in it, they may not feel the need to nom on your plants. A lot of people feed them food with very little plant material, and don't realize that platies are omnivores. Or, just get plenty of tough plants and/or cheap, fast growing ones. Anubias are good, and so are elodea, duckweed, water sprite, and water wisteria.
Yes but the point is is the guppies have pretty fins Neons might hurt there fins. The more Neons you have the less likely there will be nipping. What strain of Neons are you getting?
I didn't know there were more than one strain.(I'm fairly new to fishkeeping)I only have 3 fancy guppies the rest are guppies but look sort of like endlers so they don't have long tails.I don't know if that makes a difference.