I did think of that as I have small mandarin so I plan them during daytime when most fish active and mandarin are hiding in the rocks and won’t get sucked up threw power head accidentally.
I also have a pair of mandarins. I wish you well as I like the idea. Just too uncomfortable to try it. And I know the ocean really throws fish around at times also. I do blow off my rocks. Just in a more controlled, mostly risk free way. I have also lately decided to use the incoming water to stir up the sand-bed a bit where it is hard for me to vacuum. I think if my tank were not so deep it might be a bit easier to keep "stuff" from settling into the sand-bed. I also probably feed them more than necessary.
Shelley