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That looks like a trickle tower that is typically used for fresh water systems. The downside to a trickle tower is the bacteria growing on the media will die if your return pump (drain line) is off for any period of time. Submerged media does the same thing without the risk of your nitrifying bacteria dying if your return pump fails or the power goes out. Can you add a 10 gallon tank that drains into your tank or sump, yes. Would I do that if I had your equipment, no. I would either modify your current sump, or build/buy a new one that had a refugium section built into it. It'll be safer for both leaks and less risk to your tank if the pump or power goes out.
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