[Raul-7]

Why not use a sump? It's much simpler than using a closed-loop to have ATO/WC's?

 

[Raul-7]

Yeah I kind of regret not going for the sump... but I already had the filters, and I've never used a sump before... so I just re-used my filters. Also, the tank is only 100 gallons, its really not that big. If it was 180+ gallons or something I definitely would have gone sump.

water changes and ATO is easy with the setup I built, and I don't have to worry about overflows and such, which would have just been one more headache for me.

You can use sumps on any size aquarium. Plenty of reef people use sumps on 10-30 gallon aquariums. After I tried a sump on my 80G; I'll never go back to using a canister. A sump is much more convenient and easier to maintain than a canister.