I moved my big guy over when he started folding back along his own length to stretch out. There's really no set time or size... just when you notice they don't really fit in the 10g comfortably anymore. Or you can't put hides big enough for them into the tank.
**Adriana - White 'N Nerdy!**
1.0 BP 'SunSpot', 0.1 Corn 'Freya', 1.0 IJ BTS 'Topaz', 1.0 ND bunny 'Licorice'