Water motion in tank.
troy and others
i don't remember the details but will look em up in my coastal engineering text from uni. what i remember from school is the moons gravitational pull is less so at the equator and more so towards the poles. will have to look to see if thats cuz the volume or mass of water is so much greater towards the poles. i've dove hawaii and they do have tidal exchanges, but cancun and bali for ex have very little tide. of course ther is still some, but not like what we get out by tofino! in the tropics i think the driving force for currents is wave action which results in surge hence all the surge devices. otherwise we would just run our pumps from one side of the tank for 6 hrs, then switch em up. thats exactly what we have on the west coast, especially places like quadra island, current moves up to 10 knots in one direction, then switches 6 hrs later. but i'll check on why i didn't think they had much for tides in the equatorial areas. as for diving i have dove the foreshore reef of cozumel and some of the lagoonal areas of cancun / play del carmen. as well as hawaii where i saw a 5' reef shark!
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