I would stay with the sch 40 PVC (it's white) because it's rated to carry water for human consumption...the only other thing you can use that should be safe, but alot of people will try and say differently is the use of ABS Pipe!(the black stuff used to plumb your house!!
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500G Mixed Reef
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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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