White things on glass in my sump

Alenya

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Not pods - no idea what this is. On multiple surfaces, like a branch. About 1cm across. Any idea?

1B559467-402C-4A41-B83E-1E4F0EA8F4E6.jpeg
97BBD225-133F-4B5D-A9FF-4E341CA5F652.jpeg
 
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Alenya

Alenya

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The branchy bit is stuck more on the glass with only a little bit off into the water column. I just want to check it’s not going to be bad for the tank.
 

Freshwater filter only or is it? Have you ever used an HOB filter on a saltwater tank?

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