I wouldnt rush throwing these guys into a 240g tank. These are juvies..you said 2"..a tank that big will be detrimental to growth. If you really want to get them growning take out the sustrate and add a small layer of pool filter sand if you wish not to do bb. Take out all the tank mates and go to town feeding and doing water changes.Thanks for the reply. The tank isn't new but I think you are right about the available space.I'm planning on building a new 240 gal in the next couple months to address that problem. Just hoping to keep all my friends happy and alive until then. thanks again for the advice