Internal vs External overflow

dadarara

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looking for suggestions and opinions please.

in planning stage of my first reef build... DIY as much as I can.
have exactly space for a DT of 59"L 17"W 25"H , which is about 108G.
have two choices bellow. I think the external overflow is the better option for me.
my thinking is :
I dont want to drill the tank. so this side panel will be lower by 2" and the DIY acrylic overflow will be glued to the side with silicon. the 3 Bean Animal drain pipes together with wide side surface for silicon should be ok to support the weight.
the cost of extra-clear glass will cost about 900$ here. so its something to consider.




Screen Shot 2021-01-19 at 21.27.12.png
Screen Shot 2021-01-19 at 21.25.15.png
 
You might have an issue with the acrylic not adhering to the glass with silicone. Over time it can fail. Glass to glass would be better
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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