They are like bulldozers! They shovel up a mouthful of sand and spit it out somewhere else! They will keep doing this until they hit bottom. Its funny when one drops their sand in the spot another is digging out! It takes the other one all day LOL
The first time my daughter saw it, she happened to glance at the tank to see sand going everywhere! She says "what the he!!??" It was my Acei doing a full body dig
She thought that was the craziest thing she ever saw! One time I saw a fake plant walk across the tank! It was a male who thought it didn't belong there so picked it up by the stem and was moving it over hahaha. Never a dull moment in a Mbuna tank, that's for sure.