fish friendly plants that can have fully submerged roots?

Hey guys, took on a quick project. I have good filtration for the tank but I love allways doing something with my tank. I would like to help ease W/C's with additional plants. As its an African tank that's a no go. So I got a planter, put some holes in it (aside from the big 1 inch one it had) and it fits like a glove ! Im going to drop some black large stones in the planter... My only question is what is a LOW light plants that is SAFE for fish and HELPs with the water quality ? I may have to find a black planter but this tan one is the only ones they had in atm... So please give me some plant love !

Id love to know what spray paints are fish safe. Also I java fern not a full submerged plant ?

edit Krylon fusion seems to be fish tank friendly... This will be painted black by the end of the day.

Yea the planter is tan, it will be black in a few hours. I actually just hooked up my power head. Its over 800 GPH I know that, it used to be in my 125 Salt tank.

Yea the planter is fully submerged but im looking to have the leaves and branches out of water t make the dead air space above my tank a little more appealing to the eye.