I'm getting ready to start building the plywood tank for my turtle. I was planning on putting it on a central sump system, but after thinking about quarantining feeder fish every time I fed her, I decided that would be too much of a pain, so I am going to keep it separate. The tank is going to be 4'x5'x18", and should hold around 220 gallons or so. I'm thinking I'll build a panel into the back and put some sort of internal wet/dry system behind it, so it will all be in one place and accessible, but hidden from view. I'm thinking something along the lines of the Seaclear systems. Anyone built one before, or have any suggestions on how I should go about doing this? The one requirement is it needs to have heavy mech filtration thats easy to change, its a very messy tank.