i dont think a DSB that size is going to provide any real benefit and if you ever need to drain and clean your sump its going to stink and be a real pain.
i would plump a 5 gallon bucket to your sump along with a small pump. Have the bucket overflow back into your sump via a bulkhead and some piping.
i believe its referred to as a remote sandbed and you can swap it out or remove it by just turning a couple ball valves when needed. Plus you can probably fit way more sand in there and still have tons of room in your sump for other stuff.
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