I plan on ordering a 732 from Todd tomorrow but... While I am browsing site Was wondering if it would be worth my while to get an AMNPS package too. I have the older style analog MES, no vents except drain hole and small hole in back for probe wires. I have read most of Todd's comments on the oxygen issue with the old MES's so am unsure which way to go. I am a computer guy so not too mechanically inclined. I have seen some comments about using a small aquarium pump too via the drain hole,, wont the plastic tubing melt ? Thoughts ?