Try eBay, you might have more luck there.
The tiger fish would eat the guppies.
Most guppies are so inbred that it doesn't really matter what you do. If you have some special "line bred" guppies, it may be worth your while to introduce another 'Line' of the same type and strengthen the strain by cross, line and in-breeding. In order to do this correctly you would have to follow the Mendellian princples of inheritance.
The lunch joke would be the goat band for bubble guppies.
team umi zomie because buble guppies would have to stay in the or the umi zomie team would eat them or stab them with a tringle.
Without much more information the question can not be answered accurately. Crayfish are scavengers and guppies are not their natural prey. If the crayfish is small enough and your guppies don't have long flowing fins then the guppies may well be too fast for the crayfish to catch. So the answer then would be none. Are you feeding the crays dead guppies? If so I would add one and see how long it takes the crayfish to eat it. Then I would add more and more dead guppies one at a time as the crayfish devours them. As the crayfish grows so it will eat more.
Without light guppies (and most other species of fish) can not see one another so it would be extremely difficult for them to locate one another let alone breed successfully. Therefor I would say that the effect of light would be to 'enable' reproduction of guppies.
Guppies are very adaptable and small in size so a very large tank is not required for them to be happy in. A 20 gallon tank would be enough to keep five guppies in.
Yes
No, Chlorine would kill them.
The best flake food for Guppies would be one that is high in vegetable matter. Another food that is heathy for them is finely chopped , and ground spinach. Guppies are largly vegetarian, But will eat most other foods.
Angelfish, fighting fish and other bigger fish would. They would do it more often too if the guppy looked weak or less strong than other guppies.
Guppies are pretty hardy fish, which means they can survive in a wide range of temperatures. I would suggest anywhere between 72 to 78.