I hope your tank is large enough for the 7 or 8 inches of fish you have in there. (1 inch of fish needs 1 gallon of water). Shortage of oxygen will cause fish to go to the top/surface for air. However Guppies (Poecilia reticulata) are naturally surface feeding fish so that is where I would expect them to spend most of there time. Surface feeders are easy to recognise simply by looking at the construction and shape of the fishes mouth. Note that it tends to open in such a way as to skim the surface of the water.
No, guppies do not suckle their young. Instead, they are livebearers, meaning that female guppies give birth to fully formed, free-swimming fry. The young guppies are independent from birth and do not receive parental care or nourishment from the mother after they are born.
Guppies can sense a rapid change of conditions in their environment and will normally respond by swimming in a hyper speed.
Fries (the term for baby guppies), are eaten by older guppies, but guppies are eaten by fish like tuna.
Only guppies breed with guppies naturally.
What are guppies
No, guppies are fish.
Guppies do not migrate.
Guppies are guppies are guppies. Tiger just describes their colouring/markings. They are the same in temperament as any other guppy.
Guppies are compatible with Bristlenose catfish, the bristlenose being one of a few catfish that can live with guppies because of the guppies' water.
The plural of guppy is guppies. The plural possessive is guppies'.
Guppies phylum is Chordata
Guppies do not precipitate. Rain does.