I found out what the coconut husks are for.
It's for the roommates' crabs.
In addition to the beta fish they now have two hermit crabs. Apparently the coconut husks get mixed in with their sand or some such shit. You know those giant plastic storage tubs that you put Christmas decorations in? Yeah, they are using one of those as the terrarium. For two teeny tiny hermit crabs. I'm not even kidding.
Oh...and the sister's cat has moved in with her today. My beautiful spare bedrooms have turned into college petting zoos.
Gotta run...Captain Carl is channeling Mr. Roper and I'm going to help him fix the roommates' door. Okay, I'm not really going to help. I'm going to stand there and make annoying suggestions until he yells at me. It's what we do.
I wonder how Stanley would have dealt with hermit crabs?