May I bring your attention to this guide. Ideally you should put an emphasis on what uses this new element will have within your suggestion and any other interactions it might have with other elements. It's also important to make sure it's not too similar to elements we already have and also if those interactions modify the behaviours of other elements, to make sure it doesn't break saves. If it's interesting enough someone might put it in a mod and it could get merged into the official game.
this element would have use in makeing better(ish) ocean and lakes in saves. it can burn when it touches fire but burns a little slower then PLNT, but unlike PLNT it can grow in salt water, i dont think it would modify any behaviors of other elements. it shouldent break saves as it is a completely new element.
i think it is useless