I'm going to set up a 55 for Brigs and Columbia Ramshorn Snails. I was wondering if anyone could tell me what the best substrate for the tank would be? Our water is about 6.0 ph and pretty soft, so I know I have to take care of that also. I want the tank to be perfect for them.

What are brigs? An internet search just brought up ships. Do you mean Pomacea bridgesii? I just found by looking for "brigs snails" that some people call them that. I just learned something. The best web site for apple snails is http://www.applensnail.net

Columbian ramshorn snails are pretty big. Standard aquarium gravel should be fine. Here's a page on them:
http://www.aqualandpetsplus.com/Bug,%20Sna...20Ramshorns.htm

At a low pH and/or low hardness, the snails' shells may dissolve, develop holes, or otherwise not grow correctly. You'll need to bring up the pH and hardness, especially the calcium levels. I suggest one of the solutions sold to make cichlid or marine tanks harder. A liquid calcium supplement may work better than what I usually suggest - crushed oyster shells, crushed coral, or cuttlebone. Adding those things won't hurt; the snails may chew on them and get some more calcium.

Good luck!

I like Kent Marine liquid calcium for all my tanks with invertebrates. I add 2-4 drops in my two ten gallon tanks (one with snails, one with a crayfish) and it works really well. I also have crushed coral in the tank with the snails as a pH buffer.