Yea I had to do that last year and feel pretty bad it's very hard to even give away guppy here so I'm not doing it again. Last year some how my guppies and goldfish wont even touch the baby guppies. they ate all the goldfish babies but not the guppies so i had 100+ guppies that I gave away. which took me a very long time to even give them away so I'm not doing that again only male this time!!Even if you did have a ton of guppies or mosquito fish breeding like crazy in there they have a small impact on biomass compared to goldfish. They are also easy to scoop out in big groups and give away/sell.