Hi, I hava a planted fish tank for about a year and a half. I have lots of tetras and most of them have died. :'( I also had a couple bottom feeders and hatchets that all died. I have two discus that look good though. I don't think that they ate them because they are bigger than there mouthes. My water conditions are 10pp nitrate no ammonia ph at 6.5 and water at 80F. HELP PLEASE!!!