Thank you. I bought the tank used in May and since then it's had a lot of setbacks. I've lost a lot of the corals and have lost quite a few fish. In the past couple of weeks my star polyps have also started taking a nosedive. I do a 10% water change every month, I check my levels, but I have no idea what's going on with it. I know you need more info as to what everything I have is and so forth but that's just to give you an idea of why I've joined this group. I see that it provides a lot of good feedback. Not to mention I love seeing pictures of everyone's tanks !!!