It's supposed to look like a cube of jello, jiggling. I tried putting banana chunks in it, but that looked very odd. The electrical attack is just taken from the way jellyfish are used in the cartoon Spongebob Squarepants, as some sort of weird electrical bees. I'm really disappointed at how hard it is to see their jiggling when they move, especially underwater where they belong. Oh well, they're just evil cubes!