Howdy all! Sand critters?

I've been sent here by a couple folks. I'm new to tanks, well, I've been dreaming for 4 years, and now I've got my tank. So far I have 3 blue/green chromis, one clown, one diamond goby, 10 blue leg crags, 5 red leg crabs, 90 pounds of fiji rock, and 80 pounds of pink fiji sand and a 75 gallon tank. My lighting is crappy. (I don't have a sump or refuguim) I'll deal with that when I get further along. Hey, money only goes so far........ My water parameters are good, PH, NO2's, NO3's, Ammo's, salinity. What kind of sand critters should I get? I've heard this forum is THE place to go for this type of question. So, should I just let this tank process, should I add more? What do you all think is the next step?

 

Welcome to 3reef. Glad to have you aboard. How long has the tank been up and running. You will want to wait for the cycle to end or you will be spending more money of livestock once they die. :-/