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What's this reddish brown algae? (Not diatoms)

Well small update, it came back! Started to notice it back in April.

The first sample that I took out last year died (probably due to my negligence). Lost its color but still had a jelly texture. A second sample tarted to grow in the tank and grew pretty large but then started dying off. Reason unknown, maybe due to heatwave and/or lack of tank maintenance. Started to die off in random spots.

These are the current growths. Two clumps but couple of random strands also on the tank silicone.
IMG_20230504_210201.jpg IMG_20230504_210516.jpg IMG_20230504_210600.jpg IMG_20230504_213924.jpg
 
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