There are a million ideas for this. Just thought I'd share my wet-dry set up for my 125. Currently I house a aro, rt gian gouarmi, tigrinus and endli. I bought a tideppol overflow for a steal of a price, I used a sterlite clear storage container for my sump it was less than 10 bucks. I then used a sterlite kitchen trash can for my tower. I drilled a ****load of holes on the bottom and sides of the trash can about a foot up. I think filled it with shotgun wadding. You can buy this as a cheap alternative to bio-balls as it has great surface area. I cut out my own plexi glass for my drip tray and drilled that. My sump was less than 40 bucks. Sump-tower-bio media, and drip tray. I think the large tower is the best feature. It provides plenty of air contact with the water. The can is approx 30 inches high fileed almost 3/4 with shotgun wadding.