Before it was like this...
![Image](http://i304.photobucket.com/albums/nn167/Dutch_lol/bak.jpg)
With the Vallisneria at the back, which grew quite high and would hang over the java ferns. But I noticed that the loaches seem to prefer a cover lower down in the tank (and not plants floating on the surface).
So I changed it to this...
![Image](http://i304.photobucket.com/albums/nn167/Dutch_lol/Aquarium2-1.jpg)
(The light is still the same, that difference has more to do with the way I shot the picture.)
Now the java ferns (which are deeper than the picture suggests) are providing cover lower down in the tank, plus the Vallisneria are no longer blocking my filter inlet which might have improved the flow. The back of the tank proved more low down cover over the whole width of the tank, so I hope it will make the kubs a lot bolder.