Why not get hornwort? It's a good live plant and requires almost no care. It's next to impossible to kill it if acclimated correctly and if you want to keep it in one spot just get some 1lb fishing line and tie it in one spot. Lots of bacteria that fish love to eat grows on it any herbivores fish are unlikely to eat it all because it grows so fast. If it gets too big cut it in half and donate to your
lfs or get credit for it if they're nice enough to do that. I used to keep it in my 10g Betta rand and he loved swimming through it as well as my mollies in my 55g
Keep calm and drum on