Here are some of mine and there story:
I have mosquito fish that i rescued. they were in such bad shape when i got them i had to feed them baby fish food because they couldn't keep flakes or bloodworms down. they had parasites and a body fungus. they were wormed and DE-fungicided. They had a few batches of all deformed babies and now finally a few weeks ago had a nice batch of healthy babies! That are sp happy not to be abused anymore.
i also have some guppies. i got them from a pet store tank that was a few inches thick in dead guppies. When i brought them home they gave birth and died.I now have there babies.
I got mystery snails, very healthy. Started off with six. One died. Now to nearly 300!
Healthy Mosquito Fish. The most room they've had there whole life.