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The pvc pipes I have are very rolly, and I’d prefer them to stay in one place when I put them in the tank. What are some good ways to keep it still? I was thinking of maybe sandpapering down one side, to make it flat enough to lie on. The purpose of the pipes is for basic quarantine uses, as well as for housing breeding pairs/trips of fish, so I’d prefer not to drill the pipes, or cut them.