Also, I called a specialty pet shop up in Tinley Park and was asking for suggestions on what to do. It turns out the owner lives a few blocks from me. He said when they first changed over to the new system, the ammonia was reading almost 5.0 and he lost a bunch of fish. He ended up having to put in a r/o system. I did lose a few VERY healthy rays a while back it could have been around the same time.