@combatwombat love the progress videos and it definitely looks like “phase 1” is almost complete . I noticed the large paver stone you have on the edges which I’m assuming is used to level and fill void space which I get. I had thoughts of doing the same thing at one point, but I didn’t like the idea of something that is concrete in the pond. I’m asking because I don’t know, but I guess there would be no fear of the concrete breaking down over time and potentially causing leeching? My reef tank days give me ptsd about concrete items and how sensitive coral and saltwater fish were.