I agree with what has been said above. I see too many unknowns to find a reason. 5 degree max water temp difference is what I try to go by, smaller fish are more fragile than larger fish.

Water temp, pH and O2 levels in the water (transport water is what I'm talking about) all need to be known. When fish haulers transport fish, they use pure O2, not air.

Like Bob said about the fish condition, I'd like to hear from the OP on the body condition of the fish - skinny or fat?

It seems the minnows are put into the main tank all at once, and not kept in a holding tank then some transferred daily for feeding. I'd rather hold the FHM in another tank and transfer daily for feeding - less stress on the filtration system in the bigger tank, less stress on the fish in the bigger tank by not having to scoop out the dead ones.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).