go with the aqua c but don't use a rio. use a maxijet. i can't stress
this any better....get an aqua c. no venturi valves to fuss with.
just plug it in and it goes. Customer service is excellent. i had
them custom modify the aqua c just a little and they stayed with me
the whole time answering email promplty and even though i was a pain
put up with me and now after more than a year I am still completely
happy.