Red spots

Drake1

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Crusty red spots on DT glass , I scraped them and it’s like purple calcium ? Any answers?
 

Being sticky and staying connected: Have you used any reef-safe glue?

  • I have used reef safe glue.

    Votes: 136 87.7%
  • I haven’t used reef safe glue, but plan to in the future.

    Votes: 9 5.8%
  • I have no interest in using reef safe glue.

    Votes: 7 4.5%
  • Other.

    Votes: 3 1.9%
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