[Resolved] Last pot in chain not getting water

I have 4 autopots with the 12 gallon reservoir that Im currently using. The reservoir is about 10 inches above the floor. The issue is that the last pot in the chain is not getting water. When I checked it today, it was completely empty. This problem occurred on my last crop so I replacing the tubing and confirmed the pot would fill HOWEVER it only fills after the other three pots have filled so I dont think its a clogging issue. I am using the 4 port T for input and to feed 3 of the pots and then another T at the 3rd pot to feed the last pot. Any idea what could be the issue? Maybe the reservoir isnt up high enough? I was contemplating getting a 5 port T and running a direct line to each pot, I just need to know what size tubing I can use.

Thanks!