overpopulation

I currently have a 90L tank with an ever-growing population of guppies. Unfortunately I don't know many other fish keepers and currently only have the one tank, so the only solution I feel like I'm left with is introducing a predator fish to help control the population. I'm stuck for ideas of...

The ramshorn snail is often seen as an aquarium pest that people want to avoid. However, they only pose a problem in an aquarium that is unbalanced. When the aquarist adds too much food to the tank, the ramshorn snails take advantage of the abundance and breed at an alarming rate. Population...

The ramshorn snail is often seen as an aquarium pest that people want to avoid. However, they only pose a problem in an aquarium that is unbalanced. When the aquarist adds too much food to the tank, the ramshorn snails take advantage of the abundance and breed at an alarming rate. Population...