The ph probe in the reactor is reading at about 6.9. These are the readings from last night: alk 7 dkh, calcium 300, tank ph 8.3. The bubble count is about 100 as min and the output is 60 ml/min. I am using kalk mixed in with my top-off water to keep the tank ph at an acceptable level. It has only been up and running for about 2 days. The tank was cloudy the first day and now it is clear. I think I had some effluent build up in the chamber because I had to disconnect it for a few days and the media sat in low ph water. I would never turn my nose up at free advice. There is always something new to learn. I am following the settings of the people on Reef Central who built this same reactor. Hopefully I can find the proper settings if I go slow enough.