Mine is a bit different and more simple... it works, but it gets very "trickly" when the water level drops. I take a piece of airline tubing, and cut a length of each individual overflow. I cut a slit into it straight across, then stick that on the overflow lip or whatever.
Also,,,.... Clean up your filter!!
Rena FilStar xP3, Aquarium Systems Visi-Therm 200W (2), Coralife 48" Aqualight 260W 6700K
10 Gallon Hexagon
Hagen AquaClear 30, Visi-Therm Deluxe 50, DIY CF 20W 6500K CF, Hagen Natural CO2 System :: Bloodfin Tetra (1), Red-eye Tetra (3), Black Skirt Tetra (3), Harlequin Rasbora (6), Platy (1), Otocinclus Catfish (1) :: Rotala Indica, Hygrophila Difformis (Wisteria), Cabomba Carolinia