Does / did it seem bloated?
They can sit and rest at a bit of an angle.
What are your water parameters?
Ammonia
Nitrite
Nitrate
PH
tank temperature?
TDS
GH/KH
what is your tank size?
How long has the tank been set up?
water change schedule?
Are you familiar with the nitrification cycle?
If not, it is explained in the Aquarium Advice article in my signature link.