Hi all I just wanted to let everyone know, if you have been having any fluid coming up the air tube or having too much of an airy draw on the ProTank, you could try cutting a carto plug (the white piece that comes stuffed inside the carto's) to the size of the inner moutpiece and shoving it inside. I have had my protank like this for about a week and it has helped out a lot with fluid getting in my mouth.. I also believe it has helped the airflow issue a little.
Here are some pics:

Here are some pics:

