Help, Trying to keep fry alive!

[joeynuna]

I started a 30 gallon tank 12 days ago with 1 black molly and 1 dalmatian molly, both females. After the 1st day, the dalmatian molly gave birth to 14 fry. The problem is the tank has not cycled yet and I'm concerned the fry wont make it. They look okay and they are eating. Out of the 14, 3 don't look well. They're smaller than the others. Any suggestions would be great. The number are:

Ammonia - .5 (i do 15% water changes everyday but the ammonia is not going down. It's always .5. I'm definitely not over feeding.)
Nitrite - 0
Nitrate - 0
PH - 7.3
PH of Tap about 7.6
Test Kit is Aquarium Pharmaceuticals Fresh water.
Note: The store suggested adding about 2 or 3 teaspoons of aquarium salt every 3rd water change. I also added 30mil of API bio-start. I'm supposed to add it again on day 14, any feelings on this?

Thank you for any help. I am new to this.