I am currently setting up a 220g (72x24x29.5) tank with a water change system that will allow me to drain and add water without the use of buckets.  It will be as simple as turning a couple of valves and flipping on a pump.  All along I believed my saltwater change tank was a 24gallon.  I just measured it and its 24x12x12 which is only a 15 gallon.  I guess I should have done that sooner.  Is a 15g water change on this tank enough?  I figure on the total water volume to be somewhere on the order of 300g so I'd be looking at 5% changes.  With the simplicity of the system, I could do this weekly if needed.  I was originally hoping to do it every other week.
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