If you start with a standard tank (such as an all-glass tank), you can do anything to said tank and be included in the 10 gallons or less category as long as the dimensions of that tank make up 10 gallons or less.
If you are buying an AIO tank it is not considered stock. Yes it may be an unmodified tank as AIO tanks go, however the "stock" category is meant to start out as a level playing field. Everyone has the exact same tank (but differently sized depending on what they go with) and they can modify it however they want as long as the glass panels aren't taken apart and put back together.
As far as I'm concerned an "all in one" tank is "pre-customized" and does not fit in this category so it will go in the "custom" category as it is the only other category we have.
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Christy's Reef Blog
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