Periwinkle snail. Generally don't last long in aquariums. They are intertidal species and will crawl off your tank and dry up.
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If you are referring to the spiderweb like things, they seem like bacterial film.
The glass anemone (Aptasia) on the right is a real problem.
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You're likely referring to this article - http://www.advancedaquarist.com/blog/harlequin-filefish-masquerading-as-its-prey
There is another article talking about a rare success by lighting guru Dr. Sanjay Joshi here - http://www.advancedaquarist.com/blog/study-reveals-orange-spotted-filefish-have-very-selective-coral-diet
Better stay away due to very poor success rate.
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Has foot, will travel. No sure fire way to stop them from moving. They will move until they find a comfy spot. Even then, it'll move again if no longer comfy.
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Too many LS too fast too soon. Take it easy bro. Let the bio filter adjust to the load slowly by adding LS weeks apart.
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Nitrate is the end product of the ANN cycle. It will continue to pile up unless exported (via water change or other methods). In a tank that had completed cycling, Ammonia and Nitrite must be zero or near zero.