Actually, if you emptied the tank to do it, that could be it. When you refilled the tank, you would might have caused a pretty big disturbance on the bottom that released a lot of trapped nutrients for bacteria to feed on. If this is the case, it will remedy itself. Since you aren't growing anything, run some carbon on it to help clean it up, keep up with regular water changes... once per day at 50% won't hurt at all, but try and not disturb the substrate too much when you are doing the water changes. Run an airstone to help raise oxygen levels and get those aerobic bacteria breaking down the remaining nutrients and it should go away within a few days/week.
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