Wet/Dry sump question

[Proud Texan]

Does the water the sump contains count for stocking?
For example if i had a 75 gal tank and a 25 gal sump and the minimum volume of water for a fish was 100 gals could i still get it because the sump actually adds 25 gals to the aquarium? Heres another scenario what if i could ad a 100 gal fish to the 75 gal cus of the 25 gal sump well what if it was a yellow tang do they need 100 gal and over because of the grazing space it provides?

[Ninong]

Does the water the sump contains count for stocking?

In almost all cases the answer is no.

For example if i had a 75 gal tank and a 25 gal sump and the minimum volume of water for a fish was 100 gals could i still get it because the sump actually adds 25 gals to the aquarium? Heres another scenario what if i could ad a 100 gal fish to the 75 gal cus of the 25 gal sump well what if it was a yellow tang do they need 100 gal and over because of the grazing space it provides?

Total system water volume is a factor to take into consideration when assessing bioload in the system -- the more water the better, etc. However, it has absolutely no effect on the amount of space (water volume) required for various fish, especially tangs.

The minimum tank size recommendations are based on a variety of factors, including aggressiveness (territoriality), swimming habits, adult size of the fish, etc. And almost all of the minimum tank sizes given on the various online vendors' websites are way too low.

A yellow tang is probably one that can get by in the smallest size tank when it comes to tangs but I personally believe that the tank should be at least 120 gallons, with 135 gallons being a better minimum size because of the longer length of the tank. However, having said that, you will still see 75 gallons as the most common minimum tank size recommended for this fish. Always remember that the minimum tank size for a tang means that's the smallest size you can get away with and that's for a single tang! Absolutely not for two of them!