I just found while researching on endangered species, that krill is one of those creatures because many marine life eat them for food. People use them to feed other fish who do not actually need them.
I think it is a good idea to skip out on krill if your fish (Betta, or other fish) don't need them. I do think fish foods have krill ingredients, which you can't really escape, unless you make your own foods.
But just krill itself skip out on (frozen, freezedried...). It does help, even a small amount.
And tell others too.
Just wanted to share this!
If anyone has an comments on this, if I am misinformed, please say something!
I found this at the daily green, on 13 most endangered sea creatures.