I wouldn't reccommend "plants" for beginners. I believe you are talking about corals and anemones. They need really expensive high output lighting. Aggressive, wierd fish are usually hardy, but most need huge tanks. I like the frogfish idea but they will eat anything and I mean anything that will fit inrto their mouth. How about a dwarf lionfish? They are really cool, but be careful what you put with it, because they will eat small fish. Octopi and seahorses are hard too keep and usually require a species only tank. My best advice would be to read and see what you like, buy live rock and a good skimmer, and go from there. In the end it is all about what you like.