Don't put ANYTHING else in the tank until it's ready. unless you want to kill it. you have a 50/50 chance your stock will live...I would even suggest letting someone hold it for you.
Ideally you don't want to put any living critters in there until after your cycle is complete, especially with a PH that isn't stable. If it climbs that high again, they'll die.
Any chance you can return them until you are ready for them or keep them in another reefers tank until yours is stable?
Let your friend hold them now...The water will clear in 1~3 days and look crystal...
don't assume it's over at that point..Test your water every day for the next 2 weeks or so and LOG IT...
I totally agree with Ron, you're not done with the cycle yet. It doesn't happen any faster because the tank is small.
Stable means no fluctuations, PH or any other parameters.