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This has been growing the past few weeks, it growing out and not spreading anyone have any ideas?

First tank and it seems to be cycled, all the levels spiked and are back with in parameters....I have green hair algae as well as diatoms on the sand and the rocks look a darker color. I am looking for some advice on what and how much I need for a clean up crew. I have a 12 gallon nano, with...

So this is my first tank ever. All that is in it is live rock and live sand. I just put it together 2 days ago. When really looking at the live rock I found this thing in one of the crevices of the live rock. I have not tried to remove it, I used a turkey baster to blow some water movement and...