How to chose inputs for ANFIC

I am working on water tank controller ,in that i want to use anfis instead of fuzzy I have read anfic concept,but can anyone tell what must be input and output for it,

1.using PID controller i sent 2 data to workspace

2.one from output of PID and other output of watertank

3.i combined those two to train anfic,generated fis and used it in simulink,but the result is inverted,useed 5 membership functions,but rules generated are less only 5,kindly help