Hello experts,
After almost a year the bio-wheels on my Penguin 330 are still, well, like new!!! I thought they're supposed to get gooey by the 'bios' taking residence on them??? I have a rather light bio-load, 55 gal with 3 angels, 1 guppy, 3 neons, 6 zebras and two CAEs.
On the other hand...