I just slathered the pvc elbows in aquarium safe sealant. If you are thinking of doing this, I would recommend that you buy 100% silicone from home depot, lowes, etc. rather than pay a 500% markup at a pet store just because it says "aquarium safe". Just make sure to get 100% silicone and stay away from anything that says mildew resistant. Thank you for the comment!
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