Originally Posted by FishyBusiness
I'm not trying to hijack the thread but what if you have PFS substrate, just sits on the top. Still vacuum it up right?
If it is at the surface you can hover a vacuum just about the substrate and remove it. This isn't the case with coarser substrates.
I let mine go (med-heavily planted) for 18 months and there was a ton of gunk in the substrate. I did some heavy vacuuming and water changes during a recent rebuild. Vacuuming was not possible when it was planted simply because there were no open areas of substrate. Currently there are fewer plants present and more open areas, especially at the front. I occasionally will vacuum those areas.