My tank was up for almost 4 months before I added 2 clown fish and two shrimp. Everything seems fine 3 weeks later. No big spike in ammonia or nitrates.
When would it be ok to add more fish? I do not want the hole thing to crash!
What kind of shrimp? Cleaner shrimp should be fine I think but not the very small shrimps.
I hear that dottybacks will go after shrimp but if they are in there first, and not itty bitty, I would think a Pseudochromis fridmani would be fine with something like a cleaner. I had some larger peppermints with mine and they did not disappear.
You can put a flame angel and a fridmani dottyback in with two clowns in a 60. I would expect that to be a nice group of fish.