Nope I've replaced all normal water and sea tiles, best idea is to use for sea and water tiles both of that.
I'm going to send you an UPS right now, If possible then I need from you to replace/I think I've left the needed space in there for a big and small rock that floats in the water inserted (Chose whichever you want, I sugguest you use the ones I have just in water with them)
Also If you think you can make an animation for the waterfall, I want to see how that works out.
Its easy you have to make an animation for one side, the other side is just the same just flipped, I hope it wont look weird)