Yes, you can absolutely top dress FFOF soil with dry nutrients. Just make sure whenever you are going the top dressing route that the top of the medium is moist at all times for proper breakdown. One downside to top dressing and keeping the medium moist at all times is there is greater chance of overwatering. Also, you may want to have yellow stickies by the medium since some pests thrive in wet conditions.
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Yes, you can absolutely top dress FFOF soil with dry nutrients. Just make sure whenever you are going the top dressing route that the top of the medium is moist at all times for proper breakdown. One downside to top dressing and keeping the medium moist at all times is there is greater chance of overwatering. Also, you may want to have yellow stickies by the medium since some pests thrive in wet conditions.