Guppy help

[Vinsgirl]

I recently introduced from a 10g tank to my 26g tank. All the fish in my 26g tank seems happy and healthy but the guppies. They all have their tails clamped up. Thats the best way to describe it. In other words they don't have their tails open like normal happy fish. Can anyone give an explanation? And what do I do to correct this

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[Matt68005]

What are your water parameters?
Clamping is a sign of many things, mostly tho, water that is not great for them
Guppies must have high water quality at all times.