He can go up and but then his body sank again. :(
He lives in a 2 gallon tank, the width and height is about both of your palm spread out.
I feel so bad right now, Nami is dying. :(

We live in a hot tropical country so we don't need to buy a heater. Our house is 36C.
He sinks upwards...

Wow mines is doing the same thing, I went to petco for help nd they gave me an antibiotic pill u put in the tank nd they told me that heals the fish...you should check it out

That pill thing kinda helps but if it's eyes are white it has a slim chance of survivng. Even mines died after it looked white the eyes. So good luck on that. Put it in a small bucket helps heal faster. It needs to be extra clean or your fish will surely die...