You can scrape the silicon off underwater, it should come off in one piece if you're careful.
Cool, I'll give it ago, although I'm thinking if theres any oil or whatever on the razor blade that could contaminate the water?
I'd avoid the Acorus mate. It is semi-aquatic and probably won't last long-term.
Cyperus helferi is quite a demanding plant and is prone to algae as it is a slow grower, probably suitable for a higher light, pressurized CO2 setup only IMO.
Thanks for the plant info. I'm still after a tall thin plant though. Possibly vallis?
BTW I just read through that blog on PFK. It's quite an interesting approach but I'm not sure why he's using the filter? That'll just mean it's not a really a "low-maintenance" tank with sponge cleaning and whatever and it'll cause an NO3 build up over time thus defeat the object of having the plants as an NH3 filter?
Thanks,
Chris