Have you tried Hikari Cichlid Bio-Gold+?
Ill admit the Bio Gold+'s first couple ingredients dont compare to the first couple ingredients of NLS (its hard to beat whole antarctic krill, and whole fish in NLS), but it also has beneficial living microorganisms which are supposed to help promote faster growth and faster waste decomposition to keep the water in better shape. Im not a chemist or microbiologist or anything like that but I can say that it does seem to speed up growth a little bit, and it DEFINITELY is the preference of my fish over NLS.
To give you an example of my fishes preference over the food, if I feed Hikari Bio Gold+ to my fish for a week and then try NLS, some fish wont touch it for a few days until they get a little hungrier. However, if the role is reversed and i feed NLS for a whole week and then switch to the bio gold+, the pickier eaters will ATTACK this food lol.
The NLS i use is the Thera+A Jumbo Fish, and sometimes I wonder if the added garlic is the culprit to not being my finicky fishes favorite.
Just my two cents. I do realize that NLS is an excellent brand of food and I may just have a few picky eaters which could have nothing to do with the food really. I also realize that a fishes preference of food doesn't necessarily make it a better choice.