my guess.....is that it isn't actually 'powder' on his little feet but unshed skin, which is making his feet slippery. I have a crested gecko and this seems to happen occasionally with them, though fortunately not with mine. I think humidity and soaking can help get the stuck shed off....though not sure what the best method is with geckos as it is much easier to keep a snake in a pan of water than a gecko (my hognose has retained eyescales once) I'm not a phelsuma person but just thought I might be able to add this point of view before you go crazy thinking he has some wacky ailment....it is probably very simple.
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Sue

0.1 Western hognose (Sola)
1.0 Crested gecko (Gator)
0.1 Egyptian spiny mouse (Mia)
2.2 mini rex rabbits (Reggie, Hayden, Jackie and Peek-a-boo)
0.1 Plott hound (Molly)
0.1 'found in someone's garage' kitty (Terra)

1.0 Betta (Flash) and 1.0 FL kingsnake (Vega) currently living with boyfriend

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