Decided to set up the tank? I have heard they click especially at first when a biofilm is building up.
I have two on jbj 28 they don't click at all glad I bought them
I actually had one that was bad return it worked for 5 days than just stop wouldn't move at all without grinding.I run 266 gph pumps with no problems for six months
Sure sounds bad but they are a great product I read the reviews of the hydor and they weren't very good