Hello, Does anyone know the exact dimensions of the Aquaclear 110's back compartment? My old filter burned out and I'm planning to replace it with the AC110, but the tank is against a wall so I'm not sure if it will fit or not. The back of the tank is about 3.6 inches away from the wall. If that doesn't work, what other cheap (basically HOB) filters can I use instead? I was thinking along the lines of two separate smaller AC filters, does that achieve the same effect? Thanks!