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Try to find small dolphins, attach some weight and test them with these fluids in an open jar in order to adjust their floatation in the intermediate zone of the both layers. It could be an improvement to this Instructable. Once more, congratulations. With some time, I will send you some photos of my little aquarium.
When in US with my wife and kids (2000), I bought a small aquarium made of acrylic, with two tiny dolphins. It is at home till today but it got some air which, I think, made some kind of dirt floating on the blue layer. Now, the grandsons are arriving and I´d like to fix it in order to keep them here at home. The main problem was: I did not have have any idea of the what were the liquid inside the box. Now, I know. Thank you very much for sharing this small gift.By the way, the dolphins have a small weight (1 and 2, each) which allow them to float stand at the surface and the other, a bit submerged.
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