So I took the bio balls out of my bio cube. It seems that since then i have developed this redish/brown stuff that sits on the top of the sand. I just kind of put 2 & 2 together and realized that the redish/brown stuff started showing up the same time i removed the last of the bio balls. Do you all think I should put the balls back in or is the problem somewhere else. I just did a water change today so i dont have any real current test results. The last bio balls have been out of the tank for at least 1.5 weeks.
Any help would be appreciated
Any help would be appreciated