kickeralpine
Aquarium Advice Activist
ok first off its a 135 gallon tank just got it set back up after i resealed it well the other day i seen brown stuff growing on my glass of my 55 gallon so i took tank all apart and cleaned it out good. i do water changes every other week and clean gravel . well was looking at the 135 and seen it was on my gravel in there to never had this problem before and i dont now what it is i dont treat the water i dont test the water so i know you all will say this is my problem . would like to know what its called and how do i get rid off it dont want to take the tank down again. its not bad yet its not on the glass and not all over the gravel just some spots and i did increase my lighting so could this cause it also right now in the tank i got about 20 tetras most fish iv ever had .please let me know what to buy so i can stop this.also how long should i run my lights no plants just fish