[quote=stingrays4"]
...i have a test kit i never use{ i prefer to trust me instincts - not recomeneded though
[/quote]
[quote=Soulassassin76"]
stingray i'm glad you said that cause i rarely use my test kit,i only
use it if i think something is wrong with the tank,and (touch wood)
that has been rare
[/quote]
Just spotted these posts and hope you aren't letting these reprobates lead you astray! [bash] 
Seriously....
.....just thought I'd mention it in case you are getting the message that it's OK to skimp on water testing because really it isn't. To be honest I'm the same as them (and many others) and rarely test my water unless I've reason to suspect there's a problem which is almost never, usually I just Feel The Force. None of us are fooling ourselves that there's any virtue in our negligence, but with experience you get a feel for what you can get away with, and that's our excuse. So don't do as we do, do as we say! Particularly since you're at a crucial stage at the mo, having added fish whilst the tank is still cycling. It's vital that you keep a very watchful eye on your water parameters over the next few weeks and be prepared to act quickly if you see any sign of ammonia or nitrite building up in the water. I can't stress that highly enough.
Very good practise in the way you introduced the fish to the tank [Y]. The corys would have been stressing a bit due to the fact that they're bottom dwellers and are very insecure when forced to remain midwater with nowhere visible to hide, this is unavoidable under the circumstances but good to hear they're happy now. Minnows on the other hand are happy midwater and would stress less in the bag particularly since they had the security of being in a group. It's very mysterious that one of them died after being released, I hope the rest are OK in the morning.
What you have written suggests that all the fish were in one bag? If so did they all come from the same tank in the shop? As a rule in shops WCMMs are kept in cold water with goldfish etc, and corys at tropical temperatures. Usually you will take fish home in water that came from the tank they were in - so if you buy 2 species from different tanks, you take 2 bags home. Just wanted to clarify that point because if the fish came from different tanks and went into the same bag the chances are that one or the other may have been temperature-shocked. It's a long shot but could explain the untimely demise of the minnow.
Anyway, this morning you will be bounding down the stairs like a kid on xmas morning and I hope that what you find is to your liking! Let us know...
Garden shed full of tanks (tropicals) and a pond.
Without understanding, knowledge is worthless