I actually doing the same thing. Put a piece of rock from my QT system to the DT when I need to remove some of the Fauna and Flora from the QT system. This is what happened to my rock as I place it into the DT from my QT system over 3 days.
Day 1. the CBB hunting pods and worms on the rock along with the Foxface having a feast. One can really see the round stomach of the Foxface
Day 3. The rock will go back to the DT. Not everything was wipe out so it will regrow quickly.
The tusk looks like he missed out!