Initially yes, but it WILL be fine after a few days. Get a big one and a small one or two small ones with a little size difference and introduce them together. If you have to add one first add one then get a smaller one. They will pair up.
When you add them together I find it sometimes useful to turn the lights off for a couple days or if you have an established fish to keep the new guy isolated in a see through container so they can't fight.
I want to add more fish because I am not home all day until late, and I cannot feed things patiently because I have more things to do once I get home. So, I just feed the fish, and they poop; and feed the coral.
You might have some problems with the perc's and cherubs. Most clowns are pretty territorial.
If it were me I'd trade in the perc's and get the cherubs!
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