I did the samething, 3 bottles tetra safestart after the big WC, but of course wait for 24 hrs before adding the safestart. Monitor the ammonia, it should start to drop down, then do light feed every other day, but still monitoring the ammonia.So no media in the 10 gal ? Nothing for the bb to colonize on except the decor and glass ?
Only thing in the 55 is the danios ? If so and if it were me i would just move the polys to the 55 ich is easily treatable ammonia in qt is a bigger enemy.
If and when you do move them try to feed very lightly as you will be increasing the bioload....again if it were me i move em and dose the 55 gal with 1 bottle of sadestart just to account for the additional bio load.
Basically did this with the 300 gal and it made all my issues disappear lol
Took maybe 1-2 weeks then ammonia got stable to 0 with twice a week WC for my tank.