Red slime

Could be. Could also be a build up of detritus. Bad lights. Or a combo of all. Whatever you do, if your going to clean it do so with all flow to your DT turned off.
 
Yea, circulation in the sump is usually the culprit in there, are you running a powerhead in there to get the water moving? I had to put one in mine for that reason.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%

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