I've heard ghost shrimp also will eat fish waste, so I've added a few to my tank. The substrate is black sand and waste isn't as easy to find as it was just a few weeks ago without any substrate at all.
Someone is sure to be offended. But, with a bare bottom tank, it was obvious that ADFs will eat just about anything they find on the bottom. I think it's because they rely more on scent to locate food than their poor eyesight.