i was at the night market few night ago... there is this game call "net your fish" the net is made of paper... so it take a bit of skill to get some goldfish... and they are using the NAN light... 
Taiwan Trip : I Found NAN Lights...
- Thread starter neoprodigy
- Start date
key to catching fish with those rice paper scoops is not to go fast, you have to slice and scoop the fish sideways, avoiding as much pressure directly against the paper. They had that game at the Richmond nightmarket i think a few years ago, probably again this year, but i haven't been yet
There's this LFS in hong kong that specialises in asian aros and flowerhorns and they use those submerged lights and have it at the front of the tank about half way up. They say it prevents drop eye and i've never seen an aro in that shop with drop eye..