Tank parameters such as KH, co2, ammonia, nitrites, nitrates, gh and any others you can think of would help. I can't claim that pH is not a major factor. I have not heard that before so I would stick with the recommended pH which would be in about the 6.8 to the 7.4 range. I keep mine at 7 and have had no issues. Also a picture of the tank might help. Also if you use any type of chemicals please let us know.
Last edited by goatnad; 08-16-2015 at 12:03 AM.