If by take care you mean kill or sterilize some of them then yes it will
UV can theoretically help but I would not depend on it to get rid of ich or the various kinds uglies. I can’t tell any difference in my system when I have the UV on or off. I keep it on since I have the system installed. I have not replaced the bulb for over two years even though I have a spare bulb sitting in my garage. One area where UV definitely helps is when dealing with Dino’s.
I am in the camp of quarantining all incoming fish since it is very easy to do and somewhat entertaining (just need a cheap 10g tank from Petco with some other basic equipment). Alternatively I buy from Kenny at HighTide Aquatics since his quarantine protocol is better than what I do.
I will also eventually do quarantine of corals but don’t have the space or budget for that right now since I plan to upgrade my reef lighting next. For coral what I do now is keep them on a rack and dip them once a week for one month straight in KCl. Not ideal but I won’t have a better alternative until a have a second system up and running.