In a 5x2 foot tank, I would say the eel should be 2 to 2 1/2 foot max befoe you upgrade. Yes they are not the most active species, but during the night and feeding time they usualy swim aeound/move quite alot more. I just added pics today to my profile page if you want to see my morays, or check my 3 photo threads. I got my tesselatta around a foot long, and in less than a year he was about 2 feet. I only feed him twice a week too and he just keeps getting longer and thicker."Pravus" the tesselatta is now in a 500gal cube tank.