Please look at my second comment in response to Ballerina's Overpopulation?!
Those ideas are drawn from people who are really serious about breeding quality guppies. I'm beginning to believe for myself that if I am keeping fish in containers of less than 10-gallons, given my schedule and tank care, I am making a big mistake. We each need to take a measure of our own resources, personalities, schedules and how much time we have to work with our fish.
If you change water like New Guppy Momma did with her 1-gallon fry tank, you can probably make that work while they are really small. There is an advantage in that the fry and food are real close together. They see the baby brine shrimp more quickly. After a time, if I leave fry in small tanks, I will lose a lot of the fry though.
An aside on your guppies and Betta. One reason they are getting along is that 70 degrees F/ 21 C is so cool for the Betta, that it is nearly anesthetized. ;) If there are any guppy drops, they are probably at an interval of greater than once a month. :)
When you remove gravel from the tank the fish were in, your remove a huge percentage of the beneficial bacteria in that tank. Plants, as mentioned, can be beneficial too and my best fish are the ones which grow out in planted tanks.
The near commercial breeders do usually run bare tanks, for one thing so that all of the newly hatched baby brine shrimp is eaten. The bare tanks also make the significant partial water changes done once or twice a week, easier. Their filtration is cycled and active. They usually seaon their water And their guppy population density is probably a small fraction of what it is in your tanks.
All the best!
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