yes that isnt uncommon at all ,I trained mine to come up to the glass when i tapped .Very cute
these might get kinda vicious towards each other when they get a little older
(they seem to do this when they reach over 2- 2 1/2 inches.You need to feed them something hard to wear there teeth down once in a while(snails , freeze dried krill),I feel
its important to introduce these as food early while they are small (mine never did take to snails).They absolutely love frozen bloodworms and krill though.If you plan on keeping these into their adulthood your going to need a good sized tank absolute minimum I would say a 55 gallon.Decorate their tank with broken line of sight
they love to adventure around and they actaully do seem to suffer from boredom alone
hope the info helps .