I think lots of people don't understand the meaning of "patience" as it relates to reef tank. Reef tank matures slowly, and you should make changes to your tank slowly.
I set up a 20 gallon clownfish tank. It has a BakPac skimmer, 3 inch DSB and 25 pounds of live rock. I seeded the tank with goodies from IPSF, caulerpa, worms, snails, pods and live sand starter.
I topped off tank with RO/DI water and add a flake once a week., and waited 2 months. After a month, The tank was full of pods, a decent caulerpa growth and no sign of hair or diatom out break. I did a 25% water change and waited some more.
After 2 months I started to look for the Ocellaris pair for this tank. I found a pair two weeks later. Put them in my hospital tank for two weeks. All together it was 3 months before the 20 gallon had anything "large and Living" in it. Had at least 5 people ask me what i was doing with an "empty" tank. I just told them you'll see later.
After adding the clowns I was set. Clowns were in heaven. All the pods they could eat. All I ever did was removed caulerpa for friends who wanted starters, and a 10% weekly water change.
I eventually sold this setup to a customer of my store a year after it was started. His kids loved how the clowns "played" in their home. I warned him that is tank is stable for what is in the tank and nothing more. Well you know what happened.
I get a call 2 months later and the tank is so hairy you can't see the fish. And there were 8 fish now in the tank.
Could this tank have handled 8 fish, maybe, but not 6 new ones in a month,.
Patience, take it slow, allow you tank to adjust to new additions before you add another. The smaller the tank, the slower you should add.