i have two overflow boxes in my tank, one in each corner. the problem i have is its sooo noisy, im guessing because the water fall into the boxes. what ways are there to quiet this noise? i mean its soothing.. but then gets irritating.
Mine is pretty quiet when the water is flowing through the sponges. When it flows over the top of them it gets a little loud.
I have a ball valve after the over flow on my 90, and when I choke it just enough to keep the water level above the exit tube (in the box on the back of the tank) it's dead silent.
Could even fill the overlowbox up with filter floss. That will quiet it down, plus act as a prefilter too. Then occasionally you will have to pull it out and either clean it or replace it. But it's cheap, even cheaper than many of the sponges out there.