I wonder if we are overreacting. It's kids bubbles. Probably made safe for kids if they drink it. Probably makes extremely persistent micro bubbles so your tank will turn cloudy. I would run the skimmer really wet and dump it. I expect you could remove it that way just like Chemiclean. Run carbon.
There are countless items safe for kids(or adults) that can be very harmful to your tank. I have no idea if bubbles is one of them, but i would be making a big deal of it also.