Sumps are designed with baffles etc so that bubbles don't end up back in your display tank. Think of your frag tank as a display tank - you probably don't want to see bubbles while inspecting or viewing your frags. That's where probably most of the salt creep in a tank happens - in a sump. A lot of people have covers over the drain area of the sump to try and reduce this. The use of filter socks helps (I don't use em). But if your think of your frag tank as a secondary display tank, you probably don't want to see bubbles. It will work the way you have it planned, but I'm just giving you an option that I would go for if I had the choice.
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