Help Removing Hose Barb from Poly Tank?

[Blue_Runner]

That is what I was thinking. I just don't want to F up the tank, ya know? Also I do not want to have to pop the tank hatch. The hatch appears to be glassed in place from the factory and since it isn't soft or anything I don't want to disturb it if I can help it. I thought it was just bedded in place but I put my hand thru the round inspection hole and felt under there and there is no seam on the underside?