29 GAL BIOCUBE WATER LEVEL PROBLEM
Ok, I am going to try to keep calm while writing all the frustrations that this problem has plagued me with since Dec. 21st, 2006. This is definitely a design problem with Oceanic(I bought this tank because I thought they had a good reputation) I was not familiar with this site at the time. I have tried everything that all these good people have suggested without to much luck in solving what is wrong.
This is how I have learned to live with it. Turn off the pump and fill the water level to where it is near the top of the back wall. Turn back on and it will adjust to a little more than the max suggested in the third chamber. I have removed the bioballs, the sponge, and have enlarged the opening between the first and second chamber. The problem that I now have is that after one day the biomechanical filter in the first chamber has to be changed. However, I just rinse it out and alternate between four that I have. You know that these filters are supposed to last about six weeks. If I don't clean them the pump chamber drops too low and it starts spewing bubbles. This is very agravating and disappointing. Keep in touch with what you find that works for you. Oh, yes, I just lost a Neon Dottyback because it jumped over the back wall into the pump chamber. I tried to catch it, trap it, but it has disappeared under the second chamber where I can't see him. This has been several days now.