Try posting in the Aquatic Frogs section of the forums, there will be more owners of pipa pipa on that forum with information. These frogs are completely aquatic and so should not be on leaf mulch. They need to be in a large aquarium full of water. I hope they are still doing well.
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~Crissy
3 Female African Clawed Frogs: Nemo, Casper, Pebbles
2 Male African Clawed Frogs: Amtrak, One-Eyed Jack
3 African Toads: Fiona, Shrek, Pickles
1 Pac Man Frog: Freddie
1 Ragdoll cat: Carman