A successful mod I made to the Durso was to drill 1/4" holes in the lower part of the stand pipe...by covering or exposing them I could increase flow and still have it silient. This worked for my single overflow Tru-vu 100 gallon...It has been that way for 8 months and really allows me the same as almost 2 overflows to control water level in the tank....I used elec tape to cover any holes if I drilled too many and when the level held I then siliconed them closed...leaving the others open...HTH
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Most of me is undrwata, most of the time!!!
Water Changes, Water Changes, Water Changes ;)
Current Tank Info: Sold until I relocate and start a new one.
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