Filtration ain't too special. 4 Big canisters (Ehein 2262's) and big sump with MBBR, W/D, socks combo. Return pumps are at about 5000 GPH. I'm definitely looking to beef things up even more (hoping pup sales can fund this LOL). May even increase my drip - currently, a bit more than 1000 gallons per week. Plus, I do 60% water changes regularly.