NO, IT IS NOT OK TO PUT THE CIRCUIT INTERRUPTER (fues or circuit breaker) AT THE SWITCHES.
The purpose of the 30A fuse is also to protect the wiring to the switches. Without it you have unprotected wiring that could cause a fire.
Put a 15 or 20A circuit breaker at each switch after the Y to cut the power to the motors. They will help protect the motors from burning up if something gets jammed in the impeller. They should allow the brief overcurrent at startup. Use a DPDT 20A rated switch to each pump, relays are not necessary. The wiring diagram is in the archives, send me an e-mail if you have difficulties or other questions.
Where are you putting the pumps? If they are in the back they need to be ignition protected. Are you sure you don't want to use aerators?
Mike
mikeskiw@gmail.com