the main reason i like the koralias is because the blast isnt as direct. its wide spread. i have a power sweep rated at half the koralia 2 and it just spews out water. the stream is more intense due to the small exit point on the powersweep.

I've got two Koralia 1s in my 15g. No sandstorm and everything is happy :)

Holy smokes... I used just a Koralia Nano in my 28g, and it, along with the return pump form the sump, are MORE than enough flow for my tank. :) Mind you, my sump is supposedly putting out about 1000g per hour. :)

I had 3 koralia nanos and a 290G return in my 3' long 12G, now I got 2 6025s plus the same return. Obviously no sand, my sps and sixline love it.