I have one...its pretty cool...they like to hide a lot..the olnly thing I ever see is his head! he'll come do the rounds of the tank if he is hungry but I keep him pretty well feed. I would think u can keep it in a 38G tank but I think they would be happier in a tank where they can streach out the full length of their body...I see mine streached out all along the back of my rockwork a lot...but its just my opinion...mine is about 2' long...great little guy though...took froozen silversides right away...I had to special order him at my LFS b/c they never used to get them in...now he sells one ever 2 weeks! Good luck!