They like it a little warmer eh. Dang I always have problems keeping my ornate Swamp Things temps high. His tank always hovers at 79.
Post a pic of his setup. I may be able to advise you in increasing his tank temp. Ornates can handle a little cooler temp so where you have him may not be ideal, but will be ok, but I may be able to help so if you want help let me know.