The operating pressure is different from the input pressure.
Operating pressure is what the marker runs at to propel a paintball, the mini operates at around 200 psi. A high pressure output tank is fine to use a mini, it will not mess anything up. That's what the regulator is for, it will only allow as much pressure as you want it to into the marker; about 200 psi or whatever you need to get the proper velocity.
thanks bro ya i was worried cause i have this tank only ben filled once hooked up to my bushy and it blew the reg pro shop guy said the tank was to high for the gun so i was wondering cause a reg for a mini wouldnt be very price happy if you know what i mean. thanks
The bushy reg could have been damaged or something else wrong with it. Most regs these days have a max input rating of 900 psi. Anything over that will start to damage seals and unless the tank is malfunctioning it shouldn't output over what it is meant too.
When in doubt though, always consult the manual for your marker.