I think my bta ate my saddleback

[velvetelvis]

I have never owned any latz but my guess is they probably don't. I have never heard of that behavior being reported by people who have kept them.
The only clowns I've seen exhibit this behavior are saddlebacks, and I believe it is more of a function of where haddoni carpets are found, often exposed in sandbeds with little to no structure around them. It's just my opinion but I assume the fish exhibit this behavior to avoid predation or being harrassed by other clowns that share the anemone.

In addition haddoni carpets will often pull themselves completely under the sand when being harassed, leaving their clowns completely exposed. If the clowns dive into the mouth, then they will stay hidden even when the anemone disappears.

Good points. One of my favorite DVDs (surprise) features nothing but footage of clownfish in the wild. I was watching it again last night and saw exactly what Winwood mentioned: a haddoni surrounded by nothing but bare sand and occupied by a cloud of saddlebacks of various sizes. It didn't look like there was enough anemone for all the clownfish seeking protection in it!