what chemicals/additives should I be using?

[matt_wahoo]

I set my 20L mixed reef tank up 2 weeks ago. The tank is almost done with cycling. I want to start buying what I will need as far as chemicals and additives soon. My tank will include sps, lps, and soft corals. What should I add and what brands are recomended?

[HighlandReefer]

I would recommend that you read the articles listed below. After that & you have a better understanding, ask away. ;)

The “How To” Guide to Reef Aquarium Chemistry for Beginners, Part 1: The Salt Water Itself
http://reefkeeping.com/issues/2007-03/rhf/index.php

The “How To” Guide to Reef Aquarium Chemistry for Beginners, Part 2: What Chemicals Must be Supplemented
http://reefkeeping.com/issues/2007-04/rhf/index.php

The "How To" Guide to Reef Aquarium Chemistry for Beginners, Part 3: pH
http://reefkeeping.com/issues/2007-05/rhf/index.php

The “How To” Guide to Reef Aquarium Chemistry for Beginners,
Part 4: What Chemicals May Detrimentally Accumulate
http://reefkeeping.com/issues/2007-09/rhf/index.php

[bertoni]

The basics are calcium and alkalinity. A two-part like B-Ionic is an easy way to get started. Beyond that, some tanks require magnesium. I'd start with a 2-part for that size tank, and see how it goes. There's a DIY version for the more adventurous.