I’ve known the twins for years, but I can still hardly ________ them apart.
2 answers:
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<h2>Answer:</h2>
A. by repeating the installation steps described in the document and referring to the diagram
<h2>Explanation:</h2>The last sentence under "Keeping It Clean" says "If the filtration system does not start when plugged in, repeat the installation steps. If it still does not work, consult your aquarium store." This is pretty much what answer A says.
Here's a photo of Edge just incase, have a good one.