Hello..im newbie to axolotl..before i bought Lulu (my axolotl name :3 ) i have done research about axolotl care..but i missed read that axolotl will eat gravel and im using gravel..i saw Lulu ate the gravel..but im not sure how many gravel lulu have eaten..but its belly not too big..lulu still eating and pooping normaly..but the last time it poop was last night..i already remove all pebbles and gravel..the gravel is about 1-1.5cm..im so worry..what should i do?will the gravel pass? i dont want lulu to die..its my birthday present..lulu is about 5 inch from head to tail..