First of all, if you're taking animals out of the wild, it's far better to collect a few safely as you have done, than to get anything (aside from axololts, and sometimes s. salamandra, etc) from a pet store. There are almost no CB salamander species offered in regular pet stores; these are wild caught animals. So not only is every pet store animal (with few exceptions) taken from the wild, but it is also shipped, handled by multiple locations, stressed, frequently unfed, overheated, and crowded even before it gets to the pet store. The animal has many opportunities to pick up disease and other problems, and this doesn't even take into consideration the frequently terrible conditions animals are housed in pet stores. Getting animals from breeders is great, but this usually requires a good deal of forethought and planning.
As for the blue-spotted/jeffersonium, be sure to check with local regulations. These species are endangered/threatened in certain states, and if both occur in the same area, it is very difficult/impossible to determine whether it is either species or a triploid hybrid without genetic testing.
The redbacks and the blue spotted should not be kept together. Redbacks are territorial, and the blue spotted/Jeffs may eat the smaller redbacks.
Redbacks may breed in captivity, but 6 may be excessive, especially since they may prove difficult to feed. Six probably could live in a 10 gallon, but given their territoriality, it'd probably be best to reduce that number unless they are able to set up effective territories separate from each other. In the wild, it isn't uncommon to find two or three in an area half the size of a 10 gallon, but they're there by choice and are able to disperse to a new hiding spot if stressed. Be sure to provide cover objects similar to in the wild. Moss and/or leaf litter on top of soil or cocofiber (or other substrates) might be a good way to keep the enclosure from drying out so fast.
No light is necessary unless you have plants. They will do just fine in a room's ambient lighting or in near complete darkness. A light photoperiod would be useful in triggering breeding activity, but isn't necessary for the animals themselves.
The BS/Jeffs are currently breeding through much of their northern range, and it might be smarter to release them so they can do their thing, and then pick up a small egg mass or a few larvae if you don't want to take from local populations.
Regardless, you should try and read about the animal before you get it, so that you can be prepared with what habitat requirements it needs, possible restrictions from keeping in your state, and quantities properly housed in a given area.
Good luck with your animals.