Help needed what is this?

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Can anyone advise what this is...some sort of algae? 4 month old tank, levels all good, cycled nitrates at zero. 2 clowns, 2 danselfish, 3 hermit crabs and 2 turbo snails and one peppermint shrimp. After throughly cleaning the sub straight noticed the growth of the black stuff in picture below. Water change again yesterday cleaned it all up but it has appeared again already today.  It's like black webs
Last Edit: Jun 17, 2019 10:18:49 pm by Tappers

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