I just filled mine with water and I had a small leak as well. Yup, i forgot to glue a joint.Ran a quick leak test this morning and found a small drip on the return line. After some trouble shooting I quickly figured out that I forgot to glue that joint.
Waiting for glue to dry before trying the leak test again. On a positive note I’m super happy with how quiet the bean animal overflow and Syncra SDC pump combo is!