I do a daily water change on my 120 reef and love it. I use pump from my basement, controlled by an Aqua jr to bring up the new water up for 1 min. In the sump I have a float switch on a timer and its on for about 15min a day, just in case of a power outage. My one problem was setting the float switch right. I solved this by using a magnetic probe holder to hold the float switch, easy to a just.
On a smaller tank I would use a dosing pumps to add and remove water. I would add the water first and then when its done, have the pump remove the water. I check my salinity about once very week or two.
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120 G sps reef, looking to build bigger. 
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