I replaced my blue gravel with black sand last night and everyone is back in doing their thing. So, just before I was to go to bed, I decided to feed them three shrimp pellets, thinking they might be a tad hungry and wondering how the sand would work.
I never realized what pigs these fish are! They kicked up a current that blew pellet stuff all over the place and even the betta was getting into the action alongside the three cory cats hunting it all down. I'll have to post pictures of the new sand later today.
I also have sand in both my five gallon and twenty-nine gallon tanks. I love, love, love the way it looks and cleaning it has been pretty easy so far. I don't think I'll use gravel again if I can help it.
My boyfriend has had some problems with algae carpeting the sand, but he's gotten that under control.