the floating bit was what concerned me, otherwise it looks ok tbh. atleast 30-40% water change done slowly is what i would do.
they like clean water and cold.
pebbles are a death trap but thats upto you .
best food really is insects (crickets, locusts, moths, worms/ etc), tadpoles, fish. diced ox heart is ok, best put on a kebab stick so you can get it infront of them.