Bloo
~ I learn something new ~ ~~~~ every day ~~~~
It certainly helps and is possibly better than a fishless cycle but mature tanks are different to newly cloned tanks - in my opinion. I've cloned before, but it's still never the same as a stable mature tank. Tanks I've found only really find a stable balance after 6 months or so - until then a slightly larger than usual water changes or more thorough vigorous filter clean can upset the balance and throw a little mini spike - and nitrite and ammonia in even the smallest quantities are not generally tolerated by shrimp.
But sounds like the survivors will be doing just fine
But sounds like the survivors will be doing just fine