If these are transported in a sealed bag... Temper first for 15 min then cut bag and swiftly pour contents through a net saving the minnows then put them in tank. the gases released when you open the bag can be toxic as heck when exposed to air-within a min or 2, can be lethal.
You could do a salt dip of the minnows into a 5gal solution first then net out and transfer to tank. Salt will kill the BH in the tank so don't salt that if you want the bullheads.
How often are you changing out water in tank???
