When shooting macro video underwater, it helps to have good buoyancy, but the only recipe for steady video is using a tripod.
There are many different options for tripods available out there, I for example use a DIY tripod made out of locline elements.
I often get asked how I get such steady footage on my videos – Having good buoyancy skills helps, but the only recipe for steady macro video is using a tripod! I use this cheap and easy DIY setup (made out of Locline elements) but there are many different options for tripods out there to choose from.