Oh yeah, I agree completely. But at least, if it says "put it in your aquarium", someone else has done it, and likely it didnt kill everything. They may add kerosene (totally hypothetical example) to the stump remover to make it smell different or something, but you dont know until eveything in your tank is dead.
Here's a related story- I once worked in a very high end veterinary clinic. In the waiting room, we had a 180 gallon reef tank, and 120 gallon with poison dart frogs, and a few small flights of finches and canaries- for the customers to enjoy while waiting. As I had much experience with all the above- I did the design and weekly "upkeep", but as this was not my full time job, we had an aquarium service company provide the supplies, and do water changes. So, the dart frogs aquarium got misted with R/O water several time a day by a mister system, and all I had to do was keep the reservoir filled- no problem. But, the frogs kept dying and I had no clue why. Until I questioned the aquarium service. Our "R/O" water was being dosed with red slime eliminator, as a precaution. This service does this will all their clients, but had never mentioned he did. Well, it does the same thing to dart frogs as it does to red slime. I dont blame he service, because they had no idea I was using the R/O water for other purposes, but it also made me mad, because it was not as labelled. I wont ever make that mistake again.
