Best ask graham... but yes, the 3 ways you asked are 3 diff categories. Per fish, you have size, finage, colour, deportment maybe something else. Highest score wins. Mine was marked down because colour wasn't fully showing ( I only got it out of the main tank 2 days before lol. It should've been setup months in advance...so I can't complain too much )
Then the other classes are similar. But there's diff judgeing criteria for each like layout of plants-wood ect interaction between the fishes, compatability thereof, landscaping ect ect.
Graham should have judging criteria or one of the other stewards