Quote Originally Posted by 1seahorse View Post
I know from my experience, the optional surface skimmer has a huge role on those chambers's water level.
this is a good point... I run a HOB skimmer in my chambers of my biocube and the problem is that due to the size of the skimmer it draws water from first chamber and dumps to second chamber and then I have a HOB overflow in the 3rd chamber causing everything to be the same level. When I lowered my overflow it drained too fast so back up it went. Unfortunately the skimmer addition also caused everything to run at the same level as the display and took away surface skimming and resulted in a film. The remedy for the film was to dose regularly with H2o2. Just my experience and may not be related to your issue but just another thought to think about.