Visi-jet is absolutely useless. You might as well throw the money out the window. I've had both. The seaclone is a little better, but far from the best. I would not even give it a passing grade- JMO. I would buy something now that will work on a larger tank later. It is pretty hard to overskim a tank, so no worries there. I use an Aqua-C Remora and absolutely love it. It blows away a seaclone-easily. They make a Remora Pro for larger tanks (40-120 gal
)You get what you pay for, so do it right the first time.