That mantis actually looks very similar to the ones native here on the west coast. There are two types of weapons that a mantis uses to catch it's lunch, which does yours have? Clubber or Spearer? The Spearing mantis will be less damaging to your glass if he hits it, the Clubbers can shatter 1/2" thick glass when full grown. I doubt yours is done growing at 6", I've caught some here that measure 12" no problem. Invest in some tongs if you don't already have some for moving things in tank, you really don't want to get nailed by one of these it HURTS.