What are these things?

Retgals

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I have some super small white things on my glass, it looks like stars or spiders. They are multiplying...
 

homer1475

Figuring out the hobby one coral at a time.
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Hydriod jellies.

Newish tank? They typically show up right after the cycle is finished, and eventually die out on their own. You can remove them if you wish as they can sting corals, but are typically of no concern.
 

Creating a strong bulwark: Did you consider floor support for your reef tank?

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