We have the Fisher Price "ocean wonders aquarium" as well. We LOVE it. My son loves it. He is 19 months old now and still loves it, and can operate it on his own. And yes, there is a remote control for it. It "grows" with your child and they will like it even when older. At a certain age, your baby will "outgrow" mobiles.
You can find it at www.amazon.com It is more expensive now, than when I got it. But it is a great crib musical toy. It has various settings, with or without music, and there is motion.
for crib toys... here is a link:
http://www.amazon.com/s/ref=nb_ss_gw/102-###-###-####-###...
This is also a real great item, the turtle constellation night light: http://www.amazon.com/s/ref=nb_ss_gw/104-###-###-####-###...
Good luck,
~Susan
www.cafepress.com/littlegoogoo