70 Water drops
Start with the fireflies as usual as they are the most problematic. Watch out for vertical matches that might start opening oysters too.
Once the fireflies are out of the way, open the oysters and get them done as they are a pain too.
At the same time though, you need to be watching for combinations and +5 moves. Use you shovels to help you do this so that you can get the maximum points in the moves given.
Its not an easy level, mainly down to the oysters so don't despair.