Since you'll be setting up a 10g, you could easily and quickly cycle that tank with some material in your other tanks. For ex. take the dirty, un-vacuumed gravel from your existing tanks and use it to line your 10. Then take some of your bio material in existing filters and use it in your 10g's filter. Lastly, fill the 10g with water from your existing tanks.
You may now put the Convict in!