Hello everyone! I am kinda new to corals and reefing and am having some trouble with my corals. I don't know what is wrong because my parameters are perfect with nitrate being the only thing that is a little high (by high I mean that it's like 5). I have also been testing my phosphates and those were at 0.5 and I bought a phosphate remover thingy today to help lower it. My calcium the last time I checked was at like 360 and I have been raising it every day to try to get it at that 400-500 range. My salinity the last time I checked was about 1.026 and my temperature stays at about 76. I am also using RO water. I did buy some coral vitamin stuff and started using it today (today I literally just put a drop of each). My tank is 20 gallons long, which I plan to upgrade in the near future. My light is this one; . Everything else in my tank has been doing fine. I am especially worried about the coral (I believe it's a leather coral) that is completely drooping over cause I moved it and pieces fell off of it.