Is my froggy ill?

[phoebe froggy]

I have the thermometer sensor stuck in the substrate,I am heating it from underneath,is this ok?

[John]

It should be, as long as the heat mat only covers part of the bottom. Do you have any better photos of the frog? It's hard to tell what state it's in. Has he eaten since you first posted about him?

[phoebe froggy]

The heatmat covers half the bottom of the enclosure,he only weighs 18g I am really upset,although he looks brighter in himself

[John]

That seems tiny - you need to take that frog to a vet and explain what's going on.