i think it would be a good idea to print up some life size pictures of full grown clown loaches, pacu's, monster cats, oscars, ect. to hang on the wall near the area where they are sold so people will actually see how big they get before buying. i think this would be more effective than just saying that the fish will get really big.
This may be the way to go. Thanks for the idea!

This store will NOT stock "Monster" species, but will special order for known educated customers.
Anyone know a source for fish posters?