yes but you see you added to much to fast restarting your cycle, 2 clowns, a six line wrasses and a scooter are far too much for a 20g just set up and finished cycling not even 2 weeks ago.
a scooter is not a good choice for a first addition imo.
see when you start testing after set up and you see the amonia drops to zero it means that you can add something small, this is going to add a very small amount of amonia to your tank on a regular basis thus keeping bacteria multiplying, as the bacteria multiplys it is able to handle stronger loads of amonia....this is called a bio load......if you add more amonia to your tank then it can handle.....it creates a "cycle" or "mini cycle" thus having to pretty much start from scratch.........it is very hard on fish.
patience is the key here
