calfo overflow questions

constantne

Member
I'm building a 30 x 15 x 13 tank and need to decide on an overflow. What's the minimal size the calfo can be? Also, I don't mind it spanning across the length of the tank but rather not. What size and how many bulkheads would you suggest?
Any other overflows that would be clean and look nice? External overflow is an idea but I'm worried about the glass cracking.
 
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