Hi, let me share my few cents' worth. Hope what I'll say will not offend others. I'm sure others have their own way.. Hehe
Basically guppies are not that fragile. Like most other fish, water plays one of the most crucial roles.
I've been keeping these as well as other strains for a few years now. And they seem to be doing well, birthing and developing fine. If you watch these conditions, it should be all right:
1) Water
It must be properly cycled, and we're talking about water that is safe for all fishes. Find out the type of water/tank condition that the previous owner had been using. It would be advisable for you to request for more water from the previous water, whether or not it is crystal clear or a little green. I know most people would want to start off with a crystal clear tank, but I feel starting with some water from the guppies/ original tank will be safer.
2) Food
No feeding for 1-2 days. Then feed a bit that day, followed by increasing the amount of food another day and so forth.
3) Acclimatization
Cannot just dump fish into a new tank of water. You have to properly and slowly do it. Can google for info.
Many bros use a bit of salt and anti-chlorine... For me I rarely use them. But I do age my water for a long time (remember to put a lid in case of mozzies) and for bigger tanks, I provide aeration. Then I might use a few guinea pigs to test out the water...
Phew! So much to say...
Good luck!
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