How would i cultivate these, my fish just loves eating them, but I tried cultivating them, and I had a hard time seeing what materials they will need, and how they keep breeding, how big of a tank and what supplies would I need?
brine shrimp have kits.... about 8 dollars for the setup that comes with enough eggs for 1 hatching, and extra aren't expensive. I have the "San Fransisco Bay" Brand
Alright, about the brine shrimp, I bought that Sanfransico Bay Brand hatchery for 20$ (canadian) and it came with 3 packs of eggs. So you put one in and wait 16 hours and then for about 2 days you get brine shrimp. After that you need to take them out of the hatchery, put them in a small bucket and use an air line pump for about 5 hours to aerate the eggs. Then pour it back into the hatchery kit and it'll produce for another 2-3 days. So it'll last you 4-5 days per package. You can buy package refills for 8$/trio. So it could last you if you keep stocking up. That's my experience.
As for daphnia, I have a great site for you! http://mike-edwardes.members.beeb.net/food.html#6
There's lots of information about growing your own food but it seems a little difficult and gross but if you're up for it, it'll save you tons of money!