it’s still developing, but the choice of rock size… typically for rocks bigger than substrate, I’ve used 1-2 inch sized rocks… this latest rock pile, intended to be an aufwuchs generator or sorts, has 3 spot lights on it, it’s intended to grow algae, and is piled into a back corner of the tank.. I’m currently adding micro fauna to live in the bio film and algae… my rock pile is 12 inches deep, and this time I used 2 - 4 inch rocks, which leaves enough space between them, that the fish can go into the rock pile hunting… several of the lizard loaches hang out in the pile looking out of a hole, like a moray eel would… I have one of the spotlights shining through an end of the tank the rocks are piled against, so that the light penetrates into the base of the rock pile, this size of rock seems to let water easily flow through, so it’s not a dark dead zone at the bottom… it’s only a few weeks old, and I seeded it with micro fauna less than a week ago, but I’m already seeing signs of life… I think it’s going to work out…
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