Thanks for the great comments
Rocco wrote:Very nice Mad Duff.
I have a question that has been bugging me.
How high off the substrate do the powerheads have to be? Should they be closer to the surface or to the substrate? Or does it matter?
I have 3 powerheads in that tank and 2 spray bars from 1400 l/h externals, the spray bars are above water level and at each end spraying down the length of the tank. The powerheads are at both ends of the tank, you can see in the video the two powerheads at the bottom end of the tank, these are sat on the bottom with one blowing straight down the tank and mid level and the one next to it blowing down over towards the substrate. At the other end of the tank is a single powerhead equal to both the ones at the other end that is up in the back corner blowing towards the front causing a rotation effect in the water.
Its a bit rough but this is a diagram of the layout to give you some idea:

Pardon my honesty - I am a Northerner
14 loach species bred, which will be next?