Unrelated to this tank, I went hiking this past weekend. You guys ever have those aquascaping thoughts go through your head when you come across something that would look great in aquarium, like a rock or piece of driftwood or even some plant growing in a stream or runoff? Well anyway, I hiked to the Golden Gate bridge this weekend. I picked the coastal trail since it was more scenic.
Came across these wonderful looking green rocks, which look like this below.
I thought to myself, how nice would it be to collect some for my nano tank. A green rock vs black sand contrast would look spectacular. But of course, you can't have time to stop and pick when you're hiking with your girlfriend who's already raising an eyebrow at you with 2 tanks in your room. On the way back, I saw a sign talking about the type of rock in the area. It was serpentinite. On the sign, it talked about how serpentinite rock is high in nickel, but low in magnesium, calcium, and NPK, and the plants growing in the area are uniquely adapted to these conditions and can only be found here.
I didn't collect them, but I wonder if these would have been bad for setting up a tank. Anyone use serpentinite rock?