The black widow tetra reaches sexual maturity at the age of 2 yrs. They spawn at 26 c so try to maintain temperature at this.They are egg layers they give eggs on fine leaf of plants. They should feed live food and try to change 10% of water daily in order to encourage them.You keep them in groups 5 or more and let them pair up themselves.The minimum water quantity should be at least 15 gallons. When females got fat means there may be eggs in it but its not over because they are fertilized outside.After fertilisation remove the fishes otherwise they will eat the eggs.They may give up to 1000 eggs.In 36 hrs eggs wills hatched .Soon in about 7 days the fries should be moved to
large space and they should be fed newly hatched brine shrimps or processed food.Their should be adequate(sufficient) sun light to the fries.