I think your confusing 'tropical' with 'marine'.
'Tropical' just refers to the temperature of the water. Goldfish and native sea fish here in england are 'cold water' (or 'temperate'). Tropical freshwater fish in shops are tropical.
'Marine' is sea water, and is, I think, what you are talking about. Those fish are tropical marine fish, and are harder to keep than goldfish or freshwater tropical. I wouldn't recommend diving into it, without doing lots of research.
Then, if you do decide to go for it, you cant really keep any of those fish you mention: sea horses = too finicky for a first time keeper; rays = too large, by far, and hard; puffers = too big normally. Some of the smaller ones you might get away with.
Have a read on the internet about setting up a marine tank, and see what you think.
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