Whatever's convenient for you is best. Then it's not likely to get skipped. Just be sure the pump ruins another thirty minutes or so to get it well-mixed.
Let's say your minimum is 3 and you lose 3 per day. Does it matter if you dose it to 6 after dinner, it stays 6 all night long, it drops to three by dinner, and you replenish or you dose at 6 in the morning, it drops to 3 by dark, and it's still 3 in the morning when you dose it again? No. It never dipped below minimum FC for your CYA. That is the key.