Algae Type?

gmc1

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Ok.so my 90 litre is running ok.
My question is for the algae that is growing on my back wall of tank.it's a deeper red/purple than the coraline.it dosent seem slimey like cyno but unsure.I always leave the back untouched when scraping.
 

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You guessed it correctly as cyanobacteria. Either that or the lighting is playing tricks on the photo. 
 
Yeah I ordered that stuff yesterday because of previous post you had.I have cyno in my hatchet tank.I managed to scrape and syphon most of it test of the marine tank.Will keep an eye.cheers
 

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