I'm late but hopefully not too late!
The good news is that your numbers indicate declining ammonia and increasing nitrates.
It's not impossible IME, that you have zero ammonia right now. I've seen quite a few ammonia test kits give a false-positive at the lowest reading/color point....never reading what appears to be true zero.
I think your fish would be showing some kind of symptoms after several days' exposure to ammonia, even at a low level. If they are still all fine, then I think this is further evidence of no ammonia.
Presence of nitrate indicates there is a complete biofilter in place (all three bacteria at work)...which tells me that the above ideas are not impossible.
I would see if your local fish store can double check your test readings, especially on ammonia, and get their opinion on the amount present. If they say you're good, I would believe them. It would be awesome, but not necessary, if they had a better ammonia test kit than you.
-Matt
P.S. Do take everyone's advice to get your tank up to snuff for a marine system, but GO SLOWLY in general. Especially be very careful adding live rock...unless it's fully cured and has minimal-to-no exposure to air in between tanks, it is very likely to cause another ammonia cycle. (Fully cured rock CAN be safe to add though....you just need to be REALLY sure.)
P.P.S. For anyone this may help: saltwater critters make terrible gifts....buy a gift card instead. SO MUCH better that way.
