I agree. I've had mine for lil' over a year now, and are about 4 1/2 inches. As for the company, the two I have now are constantly fighting. Always hear them buzzing in the other room. Years ago tho I had a trio who kept together (until a polypterus came along and snacked on them). Never know...and my pair right now are in a bare (bare floor, no ornaments) 265g.
I'VE GOT ONE THATS ABOUT 6 INCHES LONG KNOW AND IV'E HAD IT SINCE NOVEMBER WAS TO INCHES WHEN I GOT IT I WOULD SAY ANYWHERE IN THE 8-10 TEN INCH RANGE IS TOPS FOR THESE GUYS DEPENDING UPON WHAT SIZE YOUR TANK IS