I used to breed guppies in my 55 gallon tank. When th female looked like she was about to drop, I put her in a breeder trap in my 10 gallon. The 10 gallon had a ton of plants. When she dropped, they would fall out of the trap into the 10 gallon. Then I put the female back in the 55. they drop about every 28 days. I would take the fry to the LFS and trade them in for filters, supplies or food. Worked out great.