My tank looked absolutley perfect up until 2 days ago. Recently i built a sump for my 125. I made sure that i bought 100% silicone sealant for the plexiglass/acrylic walls as ive read anything else can contaminate the tank. Ive checked all param's and everything is perfect so that's why im bringing up the fact that i just did the sump. It was the day after that the sump was running that it started to decline. There isn't any fish in the tank but the coral looks like ********. I did a 40% water change earlier today and nothing has really changed. Anyone have any ideas of what to do, or if the sump silicone or something is/was the problem?