There is no forum about rhizomes, but there is Aroids forum. I found all info about callas I needed there :0). Sorry, I did not grow them indoors, so I can not answer your question. I am storing my Calla rhizomes for spring planting. Search function is really helpful though, try to browse the Aroid forum.
Good luck!

Here I grow in pots with relative ease. I plant in the spring when it is still a bit cool and then "lift" the rhizomes after the foliage dies off from frost. In my experience they are pretty easy to overwinter (bareroot) in a cool place. They typically will flower twice during their growth period. Even if carrying them through the winter was not so easy I would still buy them every spring since they are very easy to grow. Not sure about hardiness in AL. I have seen them in the ground, and I assume left there, all over central coastal CA