Unless you know you can provide them with a big enough tank in the future (125g+), don't get them.
There are tons of loaches that are a better fit for your tank size. Clowns are nice, but need a big tank eventually and while they grow slow, you won't be able to tell if they get stunted by keeping them in an improper tank.
I'm a firm believer that you shouldn't buy fish that will outgrow your tank unless you know you will upgrade later. There are more options if you can't upgrade.
What are the dimensions of your tank? You say 27-30...if I have the dimensions I can tell you exactly how many gallons it is.