Try a different brand too see if they're heavier duty. I did use the set up I described for many years without an issue (I don't remember the brand). The racks link together so it will fit in a tighter space.
I would worry about jumbo clowns when you manage to grow them that large. the reason you don't see many large loaches is because it's hard to keep fish alive, in a big enough tank for 30 years. The fish you saw in the lfs were most likely wild caught.