I don't have any experience with the pig tails.
But they're all pretty much the same I think.
You might try raising the temp to around 85. Might stimulate them a bit.

They really don't like change at all...even the big ones. If I do even a water-change it can be enough to make them stop eating for a while.
So whatever you set-up...leave them alone for a while.
My experience with the little guys was they had a harder time catching the guppies. Stick with the rosies...not a lot of water circulation or turbulence.
Good luck

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