Here the deal I got 14g bio cube with cured sand and cured live rock and cured water and ever thing tested good after few day of sitting with nothing in it. So we add a few fish everything still ok for about week or more. so then we add mushrooms about 6 of them all of them died but one I was able to get the dyeing mushrooms out before any thing could affected the tank I thought but I go to test and all the test are good but the Nitrite one so is there any thing I can do to lower the Nitrite in my bio cube? Last? Is what would have cased the mushrooms to die there where very large and happy @ the fish store????????