Hi, I have 1 Julidochromis Dickfeldi in the tank with a small group of Neolamprologus Multifasciatus, I recently removed all rocks from the tank and made a cave with a small cluster of volcanic type rock, I noticed a pit in the sand near a foxhead shell, this was an area planned for the plecs and I thought the Multis had been digging, just noticed tonight the Juli is shifting sand and making a pit, i didn't know they done this , is this common knowledge, would be interested to hear from other Juli keepers or anyone else if this as ordinary behaviour? 
