I can see that the trick to this is going to be getting the on/off adjustable to the second. There are lots of timers, but they are limited to on/off by minute.
I control my peristaltic pumps to the second with my Aquatronica...but I'm sure you don't want to go that extreme.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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