I used to use a similar version, but on a larger scale for my discus
aquarium. I took some pictures and put them on my website he
http://www.marksfish.me.uk/index.php...ask=view&id=63. It
is a few years old now, but I still get the odd email saying how well it
works for others, may be worth a look? Of course, it can also be scaled up/
down for whatever size tank you have.

Regards

Mark