What is this?

Jimbo747

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Do you know what this is. The tank is 90 gals 18 months old. The scale is is about 3 inches wide and an inch or so high. It appeared several months ago and doesn’t appear to be leaving.

2DD9CBD8-BBAC-48AF-8E07-38BF55310E68.jpeg
 
If your talking about white thing on base of rock, it’s a sponge.
 
Yes, that’s what I am talking about. Should it be left or removed?
 
I leave them. they are a sign your tank has good biodiversity. They normally grow in the sump or shade in established aquariums.
 

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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