This tank was cycled with three bottles of bio spira nearly two years ago.
I've cycled countless barebones QT setups with bio spira, a Red Sea Reefer 170, Fluval Evo 5 and 13 as well.
For the OP. Water quality is everything right now, and that means monitoring ammonia. If you are going to keep these two clownfish you will not want to feed them at all for the next day or so. Call around to confirm the availability of a bacteria-in-a-bottle product, such as Bio Spira or Fritz. There are quite a few others out there that also work.
Get the bottle (make sure it's in large enough quantity for your water volume) and bring it home, shake it up and add the entire contents to the tank. Your fish should be fine. Get an ammonia alert badge by SeaChem while your at it and install it below the water level and facing out so you can check the indicated color against the examples for various levels of ammonia.