a wet/dry sump is where your bio filter material sits above the water level in the sump and the water "drips" over the media. That is the reason for a "drip plate". If the media is simply submerged you don't need a drip plate. You could then just use filter socks for mechanical filtration. What are you using for bio media under the drip plate ?
was going to put mech media under drip plate. If it flows right it shouldn't not be submerged in that chamber.