yeah i know a drilled tank is safer but I don have to drill my tank if I get an overflow box. im shopping for an overflow on the forums. still waiting for some ppl to reply but no rush. the sump can be added on later. Main thing is getting my tank cycle started!
If you want, I could drill it for you, I have a drill bit that makes holes in glass for 1" bulkheads. And since it's a 30 I would either drill it on top right in the back or on the bottom and build an overflow if you can find some black acrylic. I did it for my gfs tank which is a 29 and it looks pretty nice