New to saltwater, what is/will this stuff be?

I just used one of my test strips, everything came out perfect according to the color charts... how much are we talking for all these other tests with test tubes and droppers and scientific stuff?
 
As in a badass mean thing to eat them... I would feel bad, otherwise ill find a way to catch those bastards, if not... I saw for sale on some live fish site a mantis thing or something like that... didnt look too scary, but there was warnings all over about not feeding it by hand because it will CRUSH YOU and SLICE YOU OPEN and dont have it in a tank with anything else, because it will CRUSH them too, including corals.... god wtf is this thing? it looked like a bug, a green leafy bug...
 
Man, just feeding these damsels I can tell how outrageously fast they are... my god, they are like a bullet from piece of food to the next piece... its actually amazing to watch... other than that they dont show them selves much...
 
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