I also had a ntt just stop swimming around and die shorty after but I contributed the death to a bump in temperature over a 12 hour period (stress /mental breakdown) The process of being caught in the wild ,shippedover seas 10-12 hour flight, being put into a pet store tank ,after a week being scooped up ,bagged, in my case driven 2 hours away and introduced into a new tank. stressfull. It has been 6 weeks sinceI had my ntt's that I baught at 1 inch 4x 6weeks ago 2x 4 weeks ago 2 2 weeks ago and now 3 are 2 inch 1 is 2 1/4 and 2 are1.5inch they are only really comfortable without the light on in natural light . They change coloring in a flash from brown whitish stripes to giold with vivid black stripes in a flash