Help! I'm A Fish (2000)

I found this animated film quite good because I liked the way it included different sea animals like a ton of fish, jelly fish, starfish, sea horse and crabs in the story. I think that this film would be enjoyed by the whole family and is suitable for children of all ages.

The story involves 3 cousins where one of them is very brainy and nearly always has a backup plan. The 3 children drank a potion they find and turn into sea creatures and have to find the antidote within 2 days or they will stay that way forever. They enlist the help of a friendly large fish to get hold of the antidote along they way but become trapped in a cage. Stella starfish sends a sea horse to get the key to release them, from the crab guard. After they get released they are able to get the antidote from the mean fish who had captured them and they drink the potion to return to normal, but did they make it in time??????