ok, so I got this idea that I want to drill my tank for my sump filter instead of using my diy pvc overflow. The thing is my tank is setup and running. I've read that some people empty their tank about half way and carefully drill the right size hole they want. I found everything I need on Aquacave website, even a jig to guide the drill while drilling. My question is would it be better to empty the tank into buckets and take all the fish out ? I have all live plants and I was thinking about leaving about 5 to 6 inches of water in for the plants. Any ideas would really help..