First loaches like to be in groups of three or more and Clown Loaches especially are very social. They also need a very large tank as they get to be 12 inches or better. Most get to 6 inches in the first year. They are also very sensitive to water quality. Your temp is a little high also. 80f is high enough unless your treating disease.
So, what size is your tank? What are the water test readings(
ammonia, Nitrites, Nitrates) ?
What are you feeding? What is yout partial
water change schedule?
Carol