Making a lava hurricane lantern? i am making a homemade lava lamo for a school project using...

i am making a homemade lava lamo for a school project using the mineral grease, and rubbing alcohol formula. My problem is i can't get motion contained by my lamp, and i single have one big blob not a few smaller ones. How do i fix this, accumulation water help a bit but the motion isn't being right. I want help, gratefulness