I agree, if I'm going to decide on a wet/dry trickle filter I will be getting a pre drilled tank. For me it comes down to which is easier/less involved to maintain. I'm thinking that once the wet/dry filter is installed, the only maintenance would be changing the filter socks or padding material directly above the drip plate; whereas with a canister I imagine cleaning the canister would require disconnecting and moving outside, taking apart, cleaning and putting all back together. From that perspective, the wet/dry seems the least hassle. But I don't know if that perspective is accurate. I like the idea of adding a HOB filter to supplment! Thanks for any advice!