Guppy swimming head down tail up?

A guppy swimming with its head down and tail up is often exhibiting a behavior known as "tail-up swimming," which can indicate stress, discomfort, or an underlying health issue. This position may also suggest that the fish is struggling to maintain buoyancy, potentially due to swim bladder problems. Observing other behaviors and the overall environment can help determine if the guppy is healthy or needs intervention. If the behavior persists, consulting an aquatic veterinarian may be advisable.