Hi fishpie.
I just wanted to add that you can get bloodworms frozen, too, I think. I use the freeze-dried once a week. But also, to vary the diet, you can give them some veggies, like a green pea that's thawed and has the skin removed, and then chopped very finely. I think people also use zucchini. I've been toying with the idea of giving mine a bit from an unseasoned nori sheet as well.
I also use shrimp pellets, since I prefer food that I don't have to refrigerate, comes in a container, and can be scooped out without a mess with a spoon.
Peas help them stay regular and garlic helps them stay healthy.
And a bit off-topic: I assume someone has warned you about your
bala shark, and how it will get too big for your 16 gallon?