The tank is cycled, and all the levels are fine.
I gave him some bloodworms last night and he ate a few, not loads, but then I guess he's really small.
I haven't seen him at the surface at all, in fact I'm a bit worried that he's not surfacing enough (how often should they surface for air?)
I have been at work today though so maybe I've just missed it. My husband said he saw him swim from one side of the tank to the other earlier.
He's currently sitting inside the crusty crab ornament with his head poking outside the door. He seems to have made friends with a pregnant platy, she was in there with him earlier.
I think I'll just keep an eye on his leg and see if it looks any worse. I can't say he's very active, but then I've never had a dwarf frog before so I don't know what's considered normal behaviour wise.
Thanks for replying, it's put my mind at rest a bit