Several article on the internet, indicate a "gooseneck" for the vent line. I've tried to install the vents with as much of a horizontal run as possible. I was wondering if the tank will vent properly, if the hull fitting is below the run of the hose, i.e., downhill, but still above the top of the tank. I'm using 2 vents, one on either end of the tank. The hull fittings are standard bronze 1 in thru hull fittings and no screens. Will this cause any problems with venting the tank?I also read on the RONCO site that you shouldn't use metal fittings with plastic tanks; any thoughts or knowledge on this. I thought the plastic for the tanks were chemically neutral.