I have had many a saltwater set up but got out of it many years ago. I want to get my feet wet again but with a small tank. Money is not the issue but want to start in the right direction. looking at Red Sea kits and others. Pros and cons is the advice that I am looking for. I do NOT want a big tank. Thinking 20 gallons or so. Kit or no kit. Curved tank? Lights. Help....