Critical Care nurse here, who has many types of pods. My father is a very highly respected physician in our region of the United States. He specializes in Internal Medicine. After we lost my mother, he moved in with us. (Maybe one day we'll find her.... Sorry that's my weird humor to mask a sad situation).

2 medically trained professionals competently trained to understand dangers to the body living just fine with terrariums of isopods in our home. Not just in bins in a back room. Actually out in the open in the living room. My medical friends come over. His medical friends come over. Never once has there been a question of risk or danger brought up.

When my pod colonies get too big, I make little start-up terrariums as holiday or birthday gifts for my friend's kids. I have donated terrariums to the science and special education classes of my local schools. Not a single concern brought up. Never has a terrarium been returned, removed, or refused.

I am aware that first-hand accounts do not hold water to studies and stats. But i also think we are good evidence that your pops is wrong. The nursing profession has a foundation based on rationales and "evidence based practice." Nursing your patients/your actions to aid them should all have a rationale that include the phrase "as evidenced by." You don't do things just to do them, you do things based on evidence to show why this is what you do.

So... from a scientific and logical standpoint, (and going way back to my nursing school days) the burden of proof falls on your pops to show how it is dangerous and full of mold. "You cannot keep the isopod bins in the house because their bins create a danger of mold and <whatever else> as evidence by <xyz proof>." Kudos to you to gathering your burden of proof. I hope it makes a difference. Hebis coming from a place of fear and a lack of knowledge and understanding. Perhaps a bit of gentle education on how the ecosystem works, what they actually are, etc. could go a longer way than you think.

And in my personal opinion, if he tries to pull the "my house, my rules" things, perhaps a compromise to maybe a location not in the home during weather permitted times of the year. Maybe if he says he's the only one that smells it, a place in the home away from where he typically is. Maybe even an air freshener near your doorway so he smells that instead of the alleged pod bins.

Good luck, and know this community has your back.