How many guppies can I put in my 200-liter tank for breeding?

Thanks for reaching out about your fish. Typically, most recommendations are 1" of fish per 3 liters of water. The better the filter system, the better the water quality and the more biomass can be handled. Remember, fish grow and therefore the biomass will increase. Good luck.

Yes, skunk cories reach 2 inches at adulthood. The general rule for tanks is one inch of fish per gallon of water. The cories will hang around the bottom while the guppies will cruise higher. Be sure to provide plenty of cover for the cories in case the guppies get nippy.

Thanks for reaching out about Timothy and Lola. First suggestion is to get a large tank. The general rule of thumb is 1" of fish per 3 gallons of water. Test and correct water quality for pH, ammonia, nitrites and nitrates. The better the filtration, the higher the bio-load. So better filtration or a second filter could help. Good luck.

Hi, and thanks for your question. There is a general rule about it which is a rough estimate not to overcrowd your aquarium and avoid excessive production of feces and organic debris. The rule is one Inch per gallon, so in 10 gallons there should be ideally 10 inches of fishes in total. You should consider as well the presence of plants and gravel and any other sort of things, which decrease the water volume of 5-10% (so 10 liters are actually 9-9.5). This rule does not consider modern filtration systems. These fish suffer genetically from a certain grade of visual impairment, so overcrowding (especially competition for food) is not recommended. At the same time, please consider as well that schooling fish (like they are) should be kept in numbers, which means more space will be needed, so be generous.

I agree and do not recommend to move the female. If your tank is big enough, you can usually purchase a breeder net and keep the babies in there. Otherwise I recommend to purchase many fake plants...etc to provide hiding so that some of the babies make it. Best of luck.

Thanks for reaching out about your fish fry and including photos of the tank. The tank size should be adequate but also depends on the number of fry being added. Proper filtration and oxygenation will be very important. Good luck.

In general these fish can all be housed together safely. The one thing to keep in mind is the amount of space needed per fish to maintain a safe and healthy environment. Each 1in of fish needs 1 gallon of water. So in a 20 gallon tan you can have 20 inches of fish. The Pleco is the only one I have concerns with as some varieties can grow quite large. Check with your local pet shop as to what needs best suit this type of fish or what type of fish suit your tank best.