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Temp, salinity, ph (more or less, there are some environmental factors that can affect ph) and nitrates is all I’d be concerned about when it comes to a fish only tank.
That said I agree with everyone here about surface area but live rock or rock in general is not the only way to get surface area.
If you run a sump you can use “bio-balls” for surface area although not recommended as they tend to be nitrate factories. If I was going to go FO and wanted some other decorations in the display tank other than rock then I’d setup a sump and use marine pure blocks/balls for surface area.
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