Scottyhorse
Aquarium Advice Addict
Now here's a controversial opinion... But you have to be willing to plan ahead.
If you want a cool fish, get some young clown loaches. These guys will grow, too. But in captivity they generally cap out at about 6 inches or so. About a foot in the wild. Problem is that even at 6", you don't have room for 3 of these guys.... But..... They don't grow just too terribly fast. You could probably enjoy some for a couple of years before you have to get rid of them. That's where the planning comes in-if you ever do anything like this, make sure you have a new and appropriate place for them to go. Might be your new 125 gallon tank, a friend, or selling to the LFS.
No no, they actually grow very fast! Also, the reason they 'cap out at 6 inches' is because they are stunted. I wouldn't start them out in anything less then a 55G, with plans of upgrading to a 150 in a few months. They also like schools!!