I have two parrot fish in my 15 gallon wth a front and a bumblebee cat all around 2-3inches.. they all get along fine but I was wondering my parrot has been weird the past few days its picking up rocks and moving them, making holes everywhere... why is this?

Sounds like the "nesting" behaviour... They dig holes, pits, depressions, move things around, clean their chosen place and... EGGS. Oh, they became much more agressive and territorial when "breed".