I am starting to potty train my 2 1/2 year old and I am seriously considering getting this toilet fish tank to entice her to go. I mean, who wouldn't be drawn in by a real fish tank in the toilet??! This somehow fits with your existing 2 piece toilet and still allows you to flush as usual. And yes, without flushing the fish =) You can get it with or without LED lighting, which is a total bonus, bathroom night light!! The Fish 'n Flush Toilet-Tank Aquarium Kit is $224 with LED lighting and $199 without. I'm not sure if Sponge Bob is included. Thanks Steph for sending this to me!
Fun, but you don't need it to train your child. However, you should train your child not to to flush Benjamins...as in this fun music video on YouTube, "Spoiked" (Google it).