If you go with artificial plants go with silk not plastic. I have a silk plant and a treasure chest decoration and a decoration that looks like coral and sea shells. See the pic in my avatar that is my 5g with my betta I just changed out the pink silk plant and replaced it with a green and fucia colored silk plant. I have a 5g minibow with whisper filter. I try not to clutter the tank with too many decorations to give the betta room to swim.