I have a 55 gallon tank with the Fijicube AIO DIY kit. I am using the Tunze 9004 in the second of two chambers. The return pump sits below the 9004. The tank is fully cycled and has been up for two months. In order to keep the 9004 from constantly foaming over, I have to almost completely close the air valve. When I do this, it will soon start to constantly make popping noises. At most I can get it to work for one day before I have to tinker with the air valve or try to move the water level up/down. I have searched every forum for answers but nothing I read works. I have taken it completely apart and confirmed it is put together correctly. What can I do to make this not something I have to constantly play with to work? Is something wrong with the unit?
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