I plan on a starting a 15 gallon solera project in a few weeks. The plan is to make a decent base beer transfer it after primary for souring. I made a really decent flanders red a year and a half ago and I'm thinking about using that recipe again since I know it's good. Or I could find a lambic recipe and run with that or make an oud brun. I'm leaning towards the oud brun. I have two options for innoculation. The first is a bottle of ecy flemish ale yeast. The other is a one gallon starter I made from extra running of an oatmeal stout. The starter is about a year old. It tastes amazing. I belive that was ecy01. My flemish ale yeast is from November of last year though. If I went that route should I make a starter for it? Also is one vial enough for 15 gallons?