thanks for the interesting in the DIY wateroutlet : )
for the DIY outlet, the idea is to replace the P20 water outlet ( nozzle)and the advantage is
1, the water current minimize on the tank floor which the bubble which generate from grass can be see clearly.
2, provide a wider playground for the fish to swim with the water current.
3, now my P20 valve can be fully open with the water output will be not too strong and too concentrate on one stream.
the steps are very simple.
1, find a tube which is with J shape.
2, drill holes around 4 mm each and 1" between, I have drill 9 holes.
3, connect the J tube and the rigid solid plastic tube with the soft rubber tube with 1.5 cm long.
4, at the end of the tube, cut a little rubber tube and wrap into spiral shape and put end of J tube which use to stop the water outout from the end of the tube.
ref:
http://www.pbase.com/image/12389878