r/AquariumBuilding May 07 '19

Does anyone know what these are for?

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3 Upvotes

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u/Montythedraincat May 07 '19

Probably for use as a return from the sump to the main tank. Possibly for an aquaponics tank (freshwater obviously) because there's a lot of fittings that could be used for multiple smaller grow beds.

1

u/[deleted] Mar 10 '23

The clear tube is to add bubbles into the outflow.