Have you ever see a timing device filled with water and coloured liquid which dripping from higher level to lower level? or in simple : a liquid version of hourglass
Yes, I have actually seen those. Similar properties to those ocean wave simulators for your desk that sway from left to right, I'd imagine they use the same or very similar fluids.
so if this kind of coloured liquid put into the tank...it become a pond inside the tank....haha.....it might just poisoning the fish to death...
You are too funny James, just too funny.
- DL