I'm plannin to get a new tank, probably around 20-30 gallons.. I currently have a nano tank.. i have bubble coral and frogspawn..

As im planning on the new tank, i hope that my future corals will keep their colors and for my fishes to have enuf nutrients and colors.. I also heard that those zooplankton or other invert feeding stuff can feed corals too, which is good rite?

So i was looking around that day and saw Kent products which has a variety of supplements like calcium, zooplankton, stromium etc..

I read in books and internet that supplements such as calcium and vitamins shud be added into tanks to ensure that the fishes and corals have enuf nutrients..

So, what kind of supplements shud i buy? Any cheaper but effective brands that u can recommend?