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My enclosure is 48" long, 24" deep, 18" tall. The water portion will be about 4-5” deep and represent about 25% of the viv's total area. I'm not exactly sure how many gallons this would equate to...maybe 15 or so gallons? I will be drilling rear of the viv to install a 1” or 3/4” Lifegaurd Aquatics fitting kit bulkhead for an overflow that will drain into a simple wet/dry sump. The water will then be returned to the viv via a jebao dcs 2000 return pump with adjustable flow rate.

My issue/question is: What size bulkhead should I use to ensure that water drains quickly enough from the viv to prevent a flood? Should I use a 3/4” or should I go with the 1”?

Thoughts and comments are much appreciated!
 

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Coming from a saltwater background back in the day it's always better to have bigger than needed or even multiple bulkheads for beananimal or other silent and purposely redundant overflows.
 
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