90's kid movie, I think, can't figure out
This is about a kid who goes to his grandparents house, I think. His grandfather has a book who will take him to a different world. I remember that the kid meets a lot of different creatures and makes a best friend. I remember there were prana fish in the water. The kid had to stop these bad creatures. I remember that the kid was in an attic and the book opened up into another world. It was not the never ending story. Could you please help. If you think you know put a title down. Thanks.