My guppies are always close to the bubbles of the pump why is this?

The guppies are short of oxygen. You should attach the air hose to a filter which will remove Ammonia biologically if you wish to do any good at all with your air pump. The bubbles are just stirring up the water and not improving anything. My advice is do a water change ASAP to remove the ammonia that is poisoning your fish. Guppies are tropical and need a temperature of around 75F. The rules for successfull fish keeping are :- 1 inch of fish needs a minimum of 1 gallon of water. :- Every tank needs a permanently running cycled filter. :- Every tank needs at least 50% of its water changed every week. Keep the above rules and your fish stand a chance. Fail in any of them and I can guarantee that you will have constant health problems with your fish.