No K1 at this time. I might use an above ground FGT as a moving bed backup filter in future. I have a sack seasoned K3 and biochip media from the old pond that I could use in it. Had K1 too, but I gave that sack to a friend.
I'm also interested in exploring anoxic filtration for nitrate control - but that might require a bit more real estate than I have. I'm thinking that a few large clay pots with overflows drilled into them could make for pretty denitrification units if planted with monstera deliciosa.
I just got back from ICT so the pictures are a bit lacking
The shower filter came in and the decking is done. I will get some fresh pics up once my muscles have recovered a bit more.