Originally Posted by Jerthunter
Thinking makes my head hurt.....
I think it is more then just rather an organism is prokaryotic or eukaryotic or even unicellular or multicellular that draws the line for human sympathy but who really knows.
I personally don't care much about tiny invertebrates. If they're useful, I nurture them, like aquarium and intestinal beneficial bacteria, and spiders. If they're harmful, I seek them out with a vengeance, like germs and fruit flies. Something larger that is either beautiful or has a personality (corals, crabs, etc.) tends to get more sympathy.
How many people on this board are distressed at the illness of a bubble coral or an urchin, but hunt down aiptasia with a vengeance? There isn't a ton of diffrence biologically or in appearance between some aiptasia, and some other corals we keep. (I know this is a bit off topic from the morality of fish cycling, but it does break down to the same matter of why some people care about their damsels, and some don't.)