No,but guppies(livebearer types) can live with small sharks like dwarf shark e.g.
yes
yes they can
Platys and black skirt tetras can live together. Harlequin rasboras, platys, and guppies are smaller than black skirt tetras and would do well together. However, the black skirts nip at fins, so if you have fancy tail guppies it is not recomended to put them in a smaller tank together.
You do not say if the guppies are common guppies or fancy, also how many male and female guppies you have, yes as far as the snails and guppies go, one point to remember is the tank water should be above 72 degrees and some live floating plants for the guppies too hide in.
Just normal water that has had all of the necessary precautions taken to upon.
No. Guppies bear live young.
The answer depends on the number of guppies. A few guppies can live in a 2.5 gallon tank or larger, temperature between 72 and 80 degrees Fahrenheit. Many people raise fancy guppies in 5.5 and 10 gallon tanks.
The puffer loves live food and will eat anything smaller than it is, it is one of the few freshwater fish that has teeth.
Are these fancy guppies or feeder guppies? If you have fancy guppies, raise the temperature to 78 to 80 degrees Fahrenheit, do frequent (at least weekly) 50% or more water changes and feed them small amounts of food every 4 hours when possible. Newly hatched baby brine shrimp are a good source of nourishment, but normally by 4 months guppies are large enough that they can be fed larger live and frozen foods.
Bristlenose catfish (normal or albino), mollies, swordtails, black widows, some tetra species and sometimes bumblebee gobbies. There are many fish compatible with guppies.
guppies have live fry
Mollies come in Black, silver, gold and any combination of the three. Guppies, (which are nothing to do with mollies) can come in all the colours of the rainbow and a few more besides.