How big are they? If they are very small, they are OK for now. But you should be looking for a larger tank ASAP that's at least 20 gallons, and at least 18" high.
Ive been keeping angels for roughly 10 years. From my experience you need a minimum of a 29g high tank to house 2. I know alot of breeders use 20g talls to breed but if you notice that is starting to change.
A used tank would be the cheapest. There is a buy sell swap section on this forum. You might find on there. I think walmart sells new tanks for pretty cheap 2.