Hello, it's great to have discovered this forum.
I installed the Zoo Med 511 for my 10 gallon tank a couple of days ago and am not sure whether it working properly. The unit makes constant "clicking" or "knocking" as if something is boiling in a pot. Also, I haven't seen any noticeable change to the water quality even after two full days of near nonstop operation. Finally, the spray bar (outlet from the canister) hasn't sprayed any water.
Has anyone used this filter to give some assistance? I was excited to finally have a nice filter and hopefully this will get resolved.

