Ok people, after consuming what is in the pic (highly recommend for those who can drink legally, can i post pic like that on a forum? pls delete it if not). Anyhow - why there is a bacterial film on the surface of the pond? And i kinda think the substrate is on a bottom of the pond! How im doing so far? What is that substrate? And how the water is getting in that pond? And will faster moving water mess the substrate up?
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