What’s this growing on my glass?

Ripa89

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Curious to see what this may be growing on the glass of my Copepod grow tank.
There are 4-5 of these that have seemingly shown up over night. I recently moved the copepods from a 5 gallon bucket into this tank. Before doing so I thoroughly washed and scrubbed this tank with vinegar and water. What is shown in this picture is very small - smaller than the tip of a ballpoint pen. For scale - in the lower left you can see a copepod.

This tank has been its own stand alone system except for one ~1” cube of live rock rubble I took from my DT to seed some BB, a jar of 5280 Pods, and OceanMagik phytoplankton fed regularly.

My DT has a handful of small pineapple sponges growing in a couple areas - my thoughts are that this could be the very early stages of them, transferred over on the small price of rubble. Interested to see what some other people think. I do not believe this is aiptaisa because there is absolutely none to be found in my main tank.
Thanks in advance!
E3142DC7-F2AB-4216-8E63-78D537185E7A.jpeg
 
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Polyp polynomial: How many heads do you start with when buying zoas?

  • One head is enough to get started.

    Votes: 27 10.6%
  • 2 to 4 heads.

    Votes: 145 57.1%
  • 5 heads or more.

    Votes: 65 25.6%
  • Full colony.

    Votes: 10 3.9%
  • Other.

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