[devonian]

I read about sumps and see this list;

"...calcium reactor, a denitrifier, a phosphate-removing reactor, a place for filtration media such as GAC (granulated activated carbon), a Kalkwasser reactor, various probes to measure common water values and an automated top-off system (float or switch). Wow, that's a lot of stuff! "

While window shopping, I see leather corals, candy cane corals, mandarins, a tang, brains, gorgonians, wrasses, some little crabs, a red and white sponge, and clams that I like.

Is there a list anywhere of which of these pieces of equipment are good for which of the animals I like? How do I know what to get for a first tank?