10 gal Betta tank, lightly planted

this is my halfmoon (Chub) tank, with a second hand (unsure of the brand) heater, in tank overflow filter made for shrimp, along with a small air stone and pump. there are 2 anubias, java moss throughout, and a java fern. a few decorations from Petco. aquasoil, black gravel and black volcanic rock