The bottom glass is likely to be tempered so i wouldn't drill the bottom! you can drill the back most likely and do a "Calfo" style overflow and put return line over the top so no need for a hole for that unless you want to.
Jebo is pretty much junk. One of the first things you should learn is that you get what you pay for. If you start out with not-so-good stuff, I can promise you that you'll be upgrading and that's a waste of money if you have to replace stuff that you aren't happy with.
For what it's worth, I run an equipment store online and can help you get stuff and give you any advice that you need.
Also, MOST glass tanks have tempered glass on the bottom pane that you can't drill. It'll just shatter on you. The tank MAY say something on the bottom glass, but better safe than sorry. Either get an over the top overflow or drill the back.
Here's a tank that I drilled the back of like swiss cheese...
Eric
What is the plumbing configuration on that tank and how many gallons is it? I am looking at drilling a 45 gallon for 1 overflow box and 1 or 2 closed loops. I need advice on the best route to take.
When I am doing the plumbing from my tank to the refugium and the return will it matter if I use pcv tubing or the flexible tube with the nylon braided through it. I know that the nylon hose is a little easier to work with but is it strong enough and hold up or should I just hard plumb it.
the tubing will work because there is not that much back pressure if you were to hold the pressure inside the hose then the strength of the hose would be in question...But i have been wrong before....