Does anyone know what these are?

Krae

Does anyone know what these are? I have tetras, mollies, shrimp, corys, banjo catfish, mystery snails and a rabbit snail, 55g, well-established tank. I can't give parameters at this moment unfortunately. I'm home for a few minutes as I'm caregiver for my mother post surgery. I can call my family later, though, for follow-up if needed.
 

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StarGirl

I think it may just be a algae-biofilm kind of build up. Is anything moving?
 
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BigManAquatics

I have not seen this in a tank. Have seen thousands of time in ponds and lakes, usually around shoreline or wood and rocks sticking out pf the water, places where the water wasn't moving so much. We usually just referred to all the green stuff as moss.
 
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Krae

I think it may just be a algae-biofilm kind of build up. Is anything moving?
It's directly in front of the HOB filter so they're waving with the current only, as far as I could tell. It's just in that one spot, so it seems odd. Thanks for replying btw:)
 
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richiep

When it gets as bad as that it's called Brown algae (diatoms) same thing
You have an excess amount of phosphate this helps to fuel and feed diatoms and its growing in your tank because you have high levels of phosphate in your tap water
Look at using phosguard to.bring this under control
Generally this comes with new tanks but yours seem to be high in nutrients
If your careful use kitchen towel and gently from the bottom wipe up the glass in one movement, then use new towel and do again, this will take the worst off and stop and algae bloom forming
 
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