I do not know what filteration i have got because the tank is pre-owned and it has not writing on it. its quite big thought.What filtration have you got on the tank? Is it planted?
No, don't breed Guppies in that size of a tank. My guppy tank is 3 gallons - less than 1/2 the size of the one you're looking at and it has two male Guppies. The tank is simply too small. Had I known what I know now, I'd either have gotten a 10 gallon for them or used the 3 gallon to house a Betta. For that size of the tank you have, it'd be fine to divide it and put two bettas in.how many guppys can i get in a 30 litre tank?, can i breed them?