Yup, definitely cyano... problems we ALL have to deal with at one time or another... siphon out all that you can.... then try to find the root of the problem...
Cyano flourishes with high phosphate and nitrate levels... so maybe try cutting back on your feeding, or make sure something hasn't died... it also grows in low flow areas, so you can try changing and/or increasing flow... and lastly, a sudden cyano bloom can mean lights that are needing replacing...
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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