Bro, 2 clowns died don't mean tank crashed. If your intention are only 2 clowns, I won't even do recycling as long as the clown is healthy. Fyi, a QT tank doesn't need to go thru the process of recycling and it called a QT tank. Yet the fish still survive in it.
There are many reasons for your clown fish death and best to read and ask around. How to introduce LS is very important too.