i have 2 penguin 350's on one of my tanks ,if i were to put bagged ceramic rings in one instead of the filter pads .... how much would this increase the bio potential of the filter , if any ?
... do you know what i could add to the filter that would increase the bio ?JoelB;2585646; said:I have an Eheim that lists the rings as being for mechanical filtering and the rough gravel (lava rocks) is for bio. I'm sure the rings do bio too so just saying.