9.) Animal X is a filter feeder. It's great for your tank.
Filter feeding is just a way to say that an animal's food is suspended in the water column. Hobbyists hear the word "filter" and make the erroneous assumption that these animals will improve their water quality. Like all animals, filter feeders turn their food into waste, which gets peed or pooped out. They turn often harmless particulates into dissolved nutrients (ammonia being the chief one). With the exception of those with zooxanthellae to uptake it, you're always going to end up with more dissolved nitrogen coming out than went in (poorer water quality).
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I do believe in keeping the temperature stable. Your comparison of the temperature of an aquarium to that of the ocean isn't really a sound argument. Once things start to go south, we are not afforded the luxury of having a gadzillion gallons of water volume and thus a temperature rise in the ocean will not equal to a possible disaster that could happen in your reef if you let the temperature creeps past a certain point.
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Whether in the ocean or in captivity, stable temperatures don't afford you any wider a margin of error in the event of a problem. The physiological tolerance of the animals is still the same in captivity or the wild. All stability does is narrow that window of tolerance.