Hi! Im new here and i figure now is good as any time to join up.......i have a problem/concern......i have a live planted tank with some tiger barbs and some rosey reds.......my concern is that recently(last week), one of my broad leafed plants and my enormous rock(both conveniently located under the filters output), have a brown fungus/mossy looking growth forming on it.....also its started to grow on the back wall of my tank also underneath the filter outflow......the plant is pok-a-dotted, the tank wall is blotched and the rock is gettting a good even spread of whatever it is.....Does anybody have any idea what it is? and how do i treat it? I check the ph, No2-, N03-, NH3/NH4+ once weekly and record my results and perform water changes when needed...i had 5 tiger barbs in the beginning and two of them died one week apart(maybe not related...just though i'd throw that in there!) and im not due up to change anything in my filter yet!