Established sand in new tank

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Wolf89

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My tanks nearly 5 months old and the diatoms and still a thick brown mat will introducing established sand from another tank help? Tank was started with bio spira, but I have added a couple live rocks
 
The thick brown mat may not be diatoms. Can you post a picture under white light?
 
The thick brown mat may not be diatoms. Can you post a picture under white light?

20191117_174331.jpg
 
Looks very green to me. I see what looks like bubbles. Maybe green cyano or..... Picture is a bit fuzzzy to my old eyes.
 
No bubbles, and I'm 95% sure it's not cyano
 

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