Looking at some of the pictures it looks as you got some cyano red/purple in color, a good thing with means biodiversity what you want.Here's some pictures. My phone doesn't take very good pics when the light starts ramping down.
I don't know all the parameters.. I'm on a budget so I've been saving a little at a time to get each one. But the alk is 8, pH is 8.2, temp is 79/80, nitrates are at somewhere between 5 and 10ppm, and phosphate is .05. I stopped using the phosban reactor like you all suggested.
Unfortunately I do find the crabs causing all sorts of mischief.
Just dont stress your self out to much, doing water changes will help keeping the water parameters right for now. But you should start doing research on the link i sent above, do planning and get test kits when you can afford it. Then get addives when you got the know how to do so.