Sort of how a tiny spider can't kill a personBut obviously, a 3/4-inch crab can't kill at 2 1/2 inch swimming clownfish with teeth! That is just logical!
...or a parasite like ich can't kill a fish
...or a small 1" echanata cora can't kill a colony of another coral?
Bigger isn't always stronger.
Your question on adequate light was covered the last time you asked. Check the advice given to you in that thread. I think it was nearly the same question.