Welcome to the forum! We'd like to see some pictures of Patches and Speedy.
If Speedy came from anywhere other than a good guinea pig rescue, you need to be sure to quarantine him for a full three weeks -- in another room, no contact between them. And if he came from PetSmart also, watch him carefully for signs of mites (scratching, biting) and upper respiratory infections. If you've already put them together, then there's no need to separate them now, but watch them both, and if Speedy has mites, you'll have to treat both of them.
I need to give you one word of caution. If you've had Patches since Christmas, he's probably in full-blown adolescence, and a pet store cage isn't likely to be large enough for two males. Some of it will depend on Speedy's age, but if you get two teen-aged boars at the same time, there'll be a lotta rumblin' and humpin' going on! And maybe snarling and biting, too. Fun times!
Can you join the cages (I assume you had a cage for Patches) with a runway of grids in between? That would give them room to get away from each other if necessary. Or look at the pictures to get ideas on expanding space.
It may not be necessary to do anything at the moment, but do keep an eye on them, and be aware that a too-small cage is often a major contributor to pig fights. If they have problems, you can expand then.
Another tip -- take out anything that has only one entrance/exit, like a pigloo, and make sure you have at least two water bottles and two feeding stations, preferable at either end of the cage. That way the dominant pig can't guard both at the same time. Weigh them frequently and record the weights so you can make sure the non-dominant one is getting enough to eat.
Other than that, read the main page of this site (
Guinea Pig Cages, Your Cavy At Home), and the stickies at the top of the Nutrition, About Cages, and Bedding threads. They've got a lot of good information in them.
Enjoy your pigs!