Cost is going to be different for all tanks. It would all depend on what type of equipment your going to buy. Used? Craigslist? New? Brand Name New? Knock off New? To many variables to hit upon.
As for Clowns, I advise no less than 20g, and especially for a Anemone, as most types will get to 10-20" in diameter.
is there a list somewhere on here or can you type up a list of things I need? You could pm me. I have a fifty five gallon but I am not going to turn it into a sw because it's fw so that wouldn't really work
Occelaris Clownfish, either Black and White or the Orange and White, either will do. And yes, you can keep a pair in a 20g tank, with an Anemone. But the Anemone will have to wait at least 6 months for your tank to mature some. And the Anemone will require strong lighting, either a 4 lamp T-5, Metal Halides or a good LED unit.
All that you have listed so far is fine. Maybe just 2 starfish, they do get some size to them, remember, you are going to keep them long enough to reach mature size. Only one Anemone in a 20g tank. They will fight and kill each other if they get close enough to each other, and they can walk around the tank, you can't keep them where you want them.
If you want more than one, I'd suggest a Max Mini Anemone.
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