Hello, I just signed up to this site because I'm having trouble with my tank and I do not know what to do, so I'm hoping someone can help me! I'm new at this hobby and really want my tank looking nice! I have a 20 gallon tank that has been running for a month (used to be 10 gallon that was running for 2 months until I went bigger) with a Corallife Aqualight HO t5. As of tonight I only have a blue damsel, pulsing xenia, an sabae anemone (that looks like its gonna be a goner) and two zooanthids. This morning I used to have a clown and goby but sadly both of them did not make it. My rocks are covered by dark brown slime (i think) and my glass is constantly covered by green dust no matter how many times I clean it. I checked my water and the ammonia was the only one just a tad higher than where it should be. pH was good, temp was fine, nitrate and nitrite was ok as well as the phosphates.. Help!