If you don't use your tub then I don't see why not, however this could shorten their life expectancy because your bath tub isn't like their normal habitat (as pets) which is a koi carp pond.
To bathe.
I use the hose. When my dog was a puppy, I filled a plastic tub with water and used that like a little bath tub.
To avoid slipping in the tub use the No Skidding Tile & Bath Tub Treatment #10900 Series. You treat your tub with this solution. Hotels and Hospitals use this product to avoid accidents in the tub. anonymous@oola.com
Use nail polish remover.
In the shower, bath tub or even when you wash your hands.
You fill the tub. Then you get in the water and soap up. Immediately rinse it off and get out of the tub. Then you dry yourself after coming out and then you're done. It helps me if I stand when I do it but what ever works. :)
Yes you can but it's bad for it
Koi is the fancy name for ornamental carp. Carp in the wild are usually dark and a dull color. Koi, a type of carp have been bred like guppies or gold fish to make them more desirable. So Koi's special use would be to make the fish in a pond visible and beautiful.
Possibly, if you really cleaned the tub aggressively with lacquer thinner or similar de-greaser.
Yes the Skylab astronauts had a weekly bath , on their day of. The tub had a vacum to suck in the water , for the next use.
showerThe Bath uses a lot more as the tub spout does NOT have a flow restrictor
Use a sponge, moistened in warm water. Don't use any detergents etc. Dry the shell afterwards with a towel.