Congrats on getting your tank started.
You mentioned you were interested in getting 2 Coral-banded shrimp.
I have one in my 29g FOWLR
(You can look at photos on my profile). He is the little devil of my tank. I've known mine for about 2 years. He is about 2" now but his antennas are 2-3 times his size. I would say with great certainty that it would be best to only get one.
They crawl around EVERYWHERE and are constantly sticking their little hand/claws into crevis' in the rock looking for food. Mine is SUPER active. And since I got an Anemone a few days ago, I've constantly had to keep an eye on him to make sure he doesn't pick at it. Whenever my fish see it coming they quickly swim away.
I wouldn't say he is aggressive but more of a frenzied eater.
He is beautiful and I think he adds great personality to my tank
Here is some links I gathered when I was learning more about him. GL!
FreshMarine.com - Coral Banded Shrimp - Stenopus hispidus - Buy Cheap Banded Coral at Wholesale
Coral Banded Shrimp, Banded Coral Shrimp - Stenopus hispidus
Saltwater Aquarium Shrimp for Marine Reef Aquariums: Banded Coral Shrimp