Hello all I have started my first cichlid tank (mbuna) and noticing random flashing on the substrate (black sand). I have hard well water, I cycled the tank before adding fish. api strip says gh 180 kh 180. I have 8 yellow Labs and 12 Demasoni in a 75 gallon tank. How do I know if I should medicate. Its not like the fis are constantly do this you have to sit and watch and you will catch one do it. I don't want to over react and medicate. Could this just be a random scratch. Thanks for any advise.