In my experience in high tidal or current areas, floats mean little. Too many and they can help drag/and or float your pots away. Out there, you're pots need to be heavy or anchored. One thing I have had luck with (but a bit cumbersome I admit) is zip tying (heavy zips) a vertical piece of rebar on 2 opposite corners of the pot so the rebar protrudes downward a foot or better from the bottom of the pot. I've never had one of those move. And if your float is under, wait until the tide starts going out and you'll find it.