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Keep the tank temperature between 76 to 80 °F (24 to 27 °C). Install a filter in your fish tank to keep the water clean.  weekly because a dirty tank can cause illness. Turn on the tank light for 8 to 12 hours a day so their spines grow.
This is the optimal temperature for keeping the baby guppies comfortable and hungry so they'll eat enough food for healthy growth. If your tank temperature isn’t within this range, you can install a heater in your tank. Choose a heater that can handle the capacity of your tank.  Cold water will make your fish too sluggish, while very warm water can harm the fish. To check the precise temperature of your water, use a thermometer that sticks to the side of your tank. You can find a tank heater at a local pet store or online. Follow the directions on your filter model to place it in the tank.  Baby guppies don’t have a strong immune system, so they’re vulnerable to disease. A filter can keep your water clean enough to protect the fry, though you still need to change the water often.  It’s best to put a thin fishnet or sponge over the intake valve in your filter, where water is pulled into the filter. That way, the baby guppies can’t get pulled into the filter. Make sure you read all of the instructions that come with your filter. cause illness. Scoop the baby guppies out of their tank using a cup or fish net. Then, pour the old water out of the tank. Wipe any algae or grime from the sides of the tank. Finally, refill it with fresh, clean water that’s been treated for chlorine. Wait until the tank thermometer reaches the optimal temperature for your guppies before you return them to the tank.  If you can’t change the water every week, replace at least 1/4 of the water each week with fresh, clean water. Chlorine can harm your fish, but you can neutralize it. Purchase chlorine treatment tablets or liquid from your local pet store or online. If you don't have this, let the water sit out for 24 hours before you use it to replace the water in your fish tank. Baby guppies that grow up in dim lighting may develop deformities, especially in their spine. A regular tank light installed at the top of your tank is all you need to give your fish light. Turn the light on in the morning, then turn it off in the evening. Don’t leave the light on longer than 14 hours a day, as the baby guppies need to be able to sleep.