I use both a time-release professional formula (that I incorporate into my soil media when mixing it up) and regular Miracle Gro soluble fert. For a time release mix, the closest to what I use is the product called "Dynamite".
I apply the Miracle Gro at 1 tsp per 5 gallons, but use it as regular watering. For EEs such as you have, you have let the pots sit in a tray containing the 1 tsp/5 gal solution, and change it every day. I have some aquatic aroids like Typhonodorum, which really like having the constant low concentration fertilizer solution to sit in. They grow like weeds in it, too!
