It's not a great idea to add that much LR
if you're not positive that it is cured. If you do want to add more LR
, my suggestion would be to take your fish back to the LFS
, then add the LR
and monitor for any ammonia spikes. After the parameters are stable, you could add fish again.
Also, if you have a small QT
, you could more your 2 fish to that and add all the LR
to the main tank, then move them back after the parameters stabilize. It sounds like you can't set up a QT