such and interesting thought.
I feel there are two aspects of this.
1. bio load -what your tank and handle
2. space in the tank for fish to live a happy healthy life.
sometimes a tank may have the bio load cap. but not the space or vise versa. so like in all things in life there a balancing act.
I am setting up two tanks right now a seahorse in space can have more fish but in bio cap. be 4-6 Seahorse. there messy
now for my 200/275 gal FOWLR it will have a lot more movement but hopefully not be overstocked.
here is my stocking list for the FOWLR:
large angel
Regal angelfish- captive bread
Majestic Angelfish
Dwarf angels:
Flame
Coral Beauty
Bicolor
lemon peel
ebili
(all introduced at the same time )
1-2 smaller wrasses
Large tang:
Blue/regal Tang OR power blue
smaller tang
1 zerbasoma yellow, Kole or purple
Butterflies:
Copperband
Yellow Longnose
Pearlscale
Latticed
Sunset
Raccoon
I might skip the both tangs and add 4-5 smaller wrasses, we will see.
