Hello,
While larger is always better idealistically, it all comes down to:
1) what you want to do, and
2) how much you are willing to spend.
The larger a sump you have, the more special dedicated areas you can have. For example, larger built-in refugium, room for nursing area, dedicated area for special filtration, etc.
I think the easy way, at least for me, is to find out what type of design(s) you want within the sump, then finalize a size for each of these design. Then that pretty much tells you what size of sump you need. Then you'd know the dimension, volume, etc.
However, I think I side with Brad on the 100g choice as that should be more than plenty.
Titus
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