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You can do what Rex Grigg does. He mixes two tablespoons of Plantex CSM TE powder into 500 ml of distilled water and then doses 5-10 ml/20 gallons three times a week for a medium light tank.....But what does the '5ml' is for when you wrote : '1/16 tsp (5ml) Trace Elements 3x a week' ? Does it mean to dissolve the TE in 5ml of DI and then pour the 5ml into the tank?...
http://www.rexgrigg.com/ferts.htm
You can also use a commercial TE liquid like Seachem Fluorish Comprehensive and dose 5-10 ml/20 gallons three times a week. However, in the long run a dry TE mix like Plantex CSM or comparable powder TE would be cheaper to dose.