New 180 gallon but not drilled

[Aquaman6410]

I'm needing some advice on what to do with a 180 that is not drilled. I'm getting the tank from a family friend who bought it new 3 years ago for African Cichlids. It currently had two fx6 filters with it that were bought with the tank. I would like to have about 8 adult discus in there once setup. I know sumps are much better when it comes to larger tanks. Any ideas of what I should do? Should I keep the fx6 or use canisters in general? Should I use a hob overflow? Is it really safe? My goal is to have something relatively quiet but ultimately safe. I'm nervous having a 180 since its a lot of water that can flood my house. I also have an eheim 2217 and ac110 hanging around if needed.

Any good fail safe or or close to it options? I thought about drilling it but I don't feel comfortable doing it and taking the chance. Also worried it would weaken the tank structure wise.

I've never owned a tank this big so filtration for it has been confusing and intimidating. The biggest fear is having a destructive flood.

[Exotic-Discus]

As long as the tank doesn't leak, I would use the two FX6 that came with it. You can always adjust the return flow of water. If you don't want to drill the tank (which I don't see the need for it), you can use on top of the tank sump, simple set up easy to maintain and clean.

97460

97461

[Akili]

If do want to drill and still want to have a sump, you can use overflow boxes like PF-1200 from Eshopp, Contact them for an appropriate size
http://www.eshopps.com/products/overflowboxes/

[farebox]

If you care to go with with an sump and not drill the tank, I highly recommend an Lifereef Pre-filter system from Lifereef.com. Have one on my 125G tank almost 2 yrs. now without any problems. Check video:https://youtu.be/5KrnCbZgNxk