Hi, it's me again,

I seem to be asking a lot of questions recently, sorry.
Anywho, I haven't done a search yet but I'm going to after I post this.
Do Crowntails prefer a certain kind of food? I have Aquarian floating pellet food and my run of the mill betta, Mars, loves it and gobbles it up like mad but my Crowntail ignores it. If I come back in an hour or so, the pellets are gone and I can't see them at the bottom.
Now, my main question is this, tonight I noticed him pecking through the gravel and eating, I have no idea what. Anyone know??