Does a coral QT need a cycle?

[Aquajan]

Hi,

I cinda bought a bunch of coral without a qt..
Not the best idea becouse I do want to quarantine them for a while.
I have them in a 10g tank now filled with 80% water of my main tank and 6x maxpect balls.
And I run a fresh water filter with white filter floss, a small WaveMaker, a heater and a 50w led unit.

So my idea is that if I just do a wc with the water of my maintank (that's 3x 30% wc a week for the qt) that's pretty mutch a insta cycle.
Five of the corals are acro's..

Ofcourse setting the qt up sooner is mutch better but... in these circumstances is this the right way to go?

 

[ReefCAKE]

Nitrifying bacteria don't populate the water column, they populate on surfaces like bio-media and rock. Transferring bio-media or rock from an established tank would do more than water changes from an established tank. I'm not really sure how much of a bio-load corals are on a tank either.

 

[Aquajan]

I dont know if the bio media is important..
There are 5 turbo snails in it to witch I need to feed some nori.
The bio balls are mainly for the snails and it might be good for overall stability.

For corals the water chemestry is important and by getting water from the main tank I replenish some elements and add some nutrients from the fish.

Does it happen that a coral dies or get damaged by rx pro?
I've dipped 16 corals at once (acans blastos, euphyllia, acros and a hystrix) and only 1 blasto got damaged some how.
It shows about 80% of his skeleton...