Unfortunately, your tank isn't really set up correctly to keep corals. As far as stocking the tank, I'd say two fish is about all you'll want in a 20H. Mine has a tomato clown and a banggai cardinal...I wouldn't add anything else. You'll need to lose the UGF
...the canister is OK. Add some LR
to the tank...about 20-30 lbs should do it. If you have a CC
substrate, I'd pull it out and go with something finer. The CC
will work, but I prefer something like Carib Sea Seaflor. If you keep the CC
, you'll have to vacuum it when you do water changes. Anemones aren't really recommended when you're starting out. They are difficult to keep and require a matured, stable tank. The mandarin needs a large, well established reef tank or he will starve to death. Most of their diet is comprised of pods
and other small critters that live in the sandbed and LR
. The harlequin shrimp eats only stars. You'll have to have a supply of these to feed it or it will die. The best suggestion I can make is for you to read "The Conscietious Marine Aquarist" by Robert Fenner. You'll find some good articles on this site as well. Welcome to AA.com!