Hi,
I would recommend drilling too. From experience, flooding will happen eventually with overflows - stupid snails!!! I drilled a 1.5 inch bulkhead in my 90g with water in it. I drilled through the back panel - 8 inches from the top and side and its 1/2 inch thick. I had it running for 2 years and it seems to be doing fine.
37G? Probably two 1 inch bulkheads will be fine. How much flow are you gonig to put through those bulkheads?
- Victor.
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