Want to start a refug/sump

Hey guys i want to start a refug/sump but i cant drill the tank so a hob overflow is my only option. i have heard bad stories about some overflow box, i just need some input on a good overflow box i can use to avoid problems. thanks guys

 

OK what size sump you thinking about and what size tank will it be supporting and performing nutrient exportation from ?

 

http://www.3reef.com/forums/i-made/nice-cheap-diy-overflow-29396.html
If your a DIY person, that thread is a good read.

CPR Overflows: Premium Aquatics
If you'd like one of the box-style over flows, id recommend the CPR overflow boxes. Make sure you buy an overflow that is rated for more GPH (Gallons Per Hour) than your return pump.

I made my own custom CPR-style overflow too, it's quite easy to make one of these yourself