I use liquid fertilizer according to the label instructions, 2-3 times per month, not every watering. Without enough light, fertilizer won't cause blooms or prevent etiolation. As you discovered, too much is not helpful.
One thing to keep in mind is that after a soil change, the new soil can have fertilizer in it. The package should say if it does. In that case, wait about 6 months to start fertilizing that plant.
