Some Hygrophila ones worth considering, maybe h.difformis. Rotala indica is quite 'bushy'.
Maybe go for some red? Alternanthera rosaefolia (small, front-mid ground) and Alternanthera reineckii (large, mid-background) - neither require co2, just good light and ferts.
Also some crypts, balansae and crispulata (tall, background), wendtii and spiralis (front-mid) - provide thick growth, but are slow.
Theres also a skill to trimming plants that make them grow bushy (I'm yet to learn this skill myself) - probably a few YouTube vids on that knocking about