A few guppies can be raised in a 30-year-old fish tank 10-20 guppies can be raised in a 30-cm fish tank, which are small tropical fish and are not big in size after adulthood. Generally speaking, the body length of male fish in adulthood is generally between 3-4 cm, while that of female fish is between 5-6 cm. A 30 cm fish tank is enough for them to move, but how many fish can be raised depends on the equipment prepared by the breeder. If oxygen pumps and filters are installed in the fish tank, it is ok to raise 20 guppies. If there is no other equipment in the fish tank, it is best for the breeder to keep 10 fish.
2. What should we pay attention to when raising guppies in small tanks1. Adequate oxygen: When raising guppies in small tanks, we should first pay attention to sufficient oxygen. If the fish tank is too small, the dissolved oxygen in the water will not be too much. Although the demand for oxygen in guppies is not particularly high, there is too little oxygen in the water, which may lead to lack of oxygen. In addition, the breeding frequency and speed of guppy are relatively fast. If breeders want to increase the number of breeding, they should install oxygen pumps to ensure sufficient dissolved oxygen in water.
2. Change water regularly: The water quality in small tanks is easily polluted, so breeders need to change their water regularly and keep the water quality clean. After feeding, breeders need to clean up food residues and feces, which can slow down the deterioration of water quality. A filter can also be installed to keep the water quality stable.
