I'm still new to these guys so please forgive any dumb questions. I have a juvi albino Senegal that I've seen just floating at the surface the past couple of days. It is in with another juvi Senegal in a 3 gallon (I know its too small but its the best I have until they are big enough for my 75), both fish are less than 3 inches long. I know its not a swim bladder thing because it can stay on the bottom with no and my tank is well established. I have not tested water but I change 80% or more every few days. I see it go up for air, and then go back to the bottom, but every now and then, it just floats up to the surface and stays there for a while. Is this normal?