Is is quite easy to distinguish between male and female guppy fish.Male guppy fish are more colorful as compared to females and have larger fins as compared to females.The most easy way to tell the difference is by looking to their anal fin.The males have more pointed and developed anal fin know as gonapodium which is used to pass sperms to females while females have broader anal fin look like fan.Females are larger and much rounder then males.The above one is male while below one is female.
Male
Female
Tips for purchasing fish tank air pumps
Larger fish tank air pump will generate more heat, it’s not always that the larger is better.Go according to need.Also fish tank pumps produces lot of sound so test them before hand.Also the heat consumption of larger fish tank air pump will be more.