I didin't increase the water flow in the aquarium.
the solution for one of my tanks were this two great fish
LOL, the yellow cori wrasse and the Target Mandarin Goby.
If this dosen't work for you will have other solution like the Flat Worm Exit is a nice product you can find in a few site and even in some local pet store.
sorry for my english and writing that because i'm form Puerto Rico
