Hi everyone, I decided to do a complete rebuild of my 75 gallon Deep Blue rimless tank. I plan to do something similar to what Fatmike did with his 57 DB. So I want to remove the oversize internal overflow and drill 4 holes to the back of the tank (2 returns & 2 overflows). I have never driller glass before so I've been watching videos online from BRS and bought the drill bits and drill guide from them. I'm buying all new filtration and a better pump to help with the flow. My tank has been filling up in the last year and my corals seem stressed out in the past couple of months due to lack of flow. Here are some pictures of the current setup:



