They might not even require flushing. I would still incorporate the cal mag at a rate of 1 teaspoon per gallon, especially if you are using an led light and/or RO water. Ideally, your’ ph could still be a little higher. I think the flush would help rid the soil of some of the excess nutrients and also help restore ph balance.
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That’s the plan. You’ve been a big help.
Keep us posted.