So my mother decided to surprise me with extra fish for my tank. Before I had one male guppy and an african water frog, tonight she added three guppies(two orange one blue) and another frog. The blue guppy is very small I assume he is young but he is swimming with his head up and tail down. I know nothing about his health history and I haven't had him long enough to make good observations. I do know the tank stats are fine but he hasn't been in long enough for it to affect him. I know of swim bladder diseases but its really hard to tell.