Those stick things that the LFS used are notoriously inaccurate...
It looks llike you did everything right. I wouldn't be nervous about the small spike especially since most of your live rock was already cured and established. Plus it's a 125 gallon tank with 4 small fishies  You would have to dump alot of food in there to make an ammonia spike. I would attribute the loss of the chromis to the lfs or something else. (sometimes I see the fish in a lfs and it sends shivers up my spine) But thats another subject.
Everything looks Great to me. Keep on track.
"Go Slow let it Grow" Matt the Kingfish
Jim
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90 Gallon glass, 135#'s of rock and 2" sand. 2-250w 20k XM metal halides. 2-95 watt actinic VHO, 4 powerheads, Coralife skimmer. Maroon Gold Striped Clown, Blue Chromis, Kole Tang, Pygmy Angel, Serpent Star, Brittle Star,Gorgonians, Mushrooms, Yellow Polyps, Turbo Snails & Blue Legged Hermits. 20 gal sump with Caulerpa, Mag 7 return pump. | 
new 125g tank 1st fish 
My tank has been set-up for about 6 weeks. I added 70lbs of live rock on the 22 of October. I really didn't have much of a cycle. Most of my live rock came from an established tank. I put cocktail shrimp in for 4days and only got an ammonia reading of 5.0. After a few days a I had a small nitrite reading, then everything went to 0. The lfs told me to wait 2 weeks and if everything is still 0 i could add fish slowly. I put 2 tank raised false clowns and 3 green chromis in on Nov,11. One of the green chromis died on the third day. He never really came out from behind the rocks. The other fish are all fine so far. I am keeping a close eye on my readings cause the small cycle has me a little nevrous. My readings for ammonia and nitrite are still 0. On the 11th the lfs tested my nitrates and he used one of those stick things and my nitrates were the first shade of pink. He said that was great. I haven't been able to get the swing of testing mt nitrates yet. I have the liquid master test kit. It has a few different things that have to be done just right or your test won't come out with the correct reading. I must do something wrong cause I have never gotten a reading,that is why I am having the lfs test the water too. I have my fingers crossed.
