Brad yours is a haddoni but I think due to the large footprint of your tank, the "relative real estate consumed" by the carpet is proportionally much smaller than average. Thus the odds of a fish randomly stumbling into the carpet are much smaller than average (so to speak).
Justin, to me the carpet looks just like a smaller version of a haddoni, but I'm stuck on the fact you say it splits. Haddoni's just don't split, as far as I know. So I'm left with believing yours is indeed tapetum, and I guess we've just learned that tapetums are potentially very strong feeders much like haddoni's.
That's my guess anyhow.
