lol com'on eric...do i seem like the type to over look those possibilities. i was using black tubing, then switched to clear yesterday. and not i changed them again. it just can pull water from that low. i watched it start to creep up the line then just stop.
Then the diaphram is going bad, you need a new one
TM1412
http://www.bigalsonline.com/Aqualifter-AW-20-Diaphragm-Kit_9944833_82.html
I have one that I'm not using right now, but I'm not quite ready to sell it. If you still want to grab the tank anyway I could probably loan you the aqualifter until you can get a new one shipped.
how about i pay u for both and u order onelol cause i need to splice the line to connect to my float switches.