As everyone will tell you this hobby you learn from your mistakes lol. Having a cycled tank and an established tank are two different things . Just my opinion but i wouldn't go to crazy with coral , other inverts , or fish until you know forsure your tank is fully cycled and is maturing . This is an exciting hobby no need to rush ( I know it's hard not too!) You could honestly cycle a tank in a week with the right products but you can't rush Mother Nature . Just a thought , you mentioned you have a pistal shrimp. I have two tigers paired off with a yellow watch man , and a candy cane with a yasha in another . There are so many awesome gobies that you can find that will pair with the pistal shrimp . One of the most underrated gobies I think is a wheeleri . Good luck with your tank and I hope it brings you Great joy as this is a fun hobby with great people ! Have a great day