here's my take on the keyrings.
the keyrings are made of soft plastic (you can see from the pics) that can be cut open and released when you buy them...
it's just a mode of transport from the shop to your fishtank at home. it's not a permanent housing containment. the chinese people are idiots, but they are not that idiotic...
the keyring concept just makes it more appealing to buy, compared to a fish in a normal plastic bag.
the tatooed fish on the other hand, is ridiculous.
as with everything, there's 2 sides. and i believe the keyring thing is not made for a keyring per se, but just an advertising gimmick to sell the fish.
the tatooed freshwater parrotfishes on the other hand, i dislike. alot.