I have a 75g saltwater tank that is running on a 30g refugium and a protein skimmer I've been havi g a lot of trouble with the tank I have a stony coral it looks like a round dome and the coral extends out of the stony like dome it keeps getting a redish silk over it that I keep removing and it seems to just keep dying any ideas on what to d to bring the coral and tank bck to health I purchased the tank from some ne else n they had a lot of trouble including there refugium breaking so I had to put the new one in