Reichart, someone beat you to the punch on the RAM Doubler idea.
It's hard to recommend the Aquarium as a full-time screen saver when I've seen it lock up several systems due to the 100% cpu usage bug. Sorry if that sounds harsh, but the responses from you and Jim on this have not been very positive. I do not feel comfortable running something 24/7 that keeps my CPU 10-15 degrees north of idle.
By running multiple copies of Winamp (9 to be exact, each running DSP FX), I was able to determine that the Aquarium only needs 40-50% of my 1400 MHz CPU to generate 60 frames per second of animation.