Sorry... What do you mean when you said he may have swallowed a clown loach? Was that loach missing or not? Your tank does not seem to have furniture, but maybe I am wrong.
Loaches have very sharp scalpel-like features under their eyes.
In general, one can open up their throat with a finger and let the tummy fill with water and then they normally throw up. As he was so small, something soft could have been used instead or for example a syringe and a soft air line could be used to inject tank water into a tummy. Like it's been done here: http://www.planetcatfish.com/forum/viewtopic.php?f=7&t=37031&hilit=+syringe
Loaches have very sharp scalpel-like features under their eyes.
In general, one can open up their throat with a finger and let the tummy fill with water and then they normally throw up. As he was so small, something soft could have been used instead or for example a syringe and a soft air line could be used to inject tank water into a tummy. Like it's been done here: http://www.planetcatfish.com/forum/viewtopic.php?f=7&t=37031&hilit=+syringe
