russrimm
Aquarium Advice Activist
Help :/. Our 20 gal that we're trying to cycle is starting to get a brown coating on all the fake plants in the aquarium. It brushes off easily, but what is it? I know that nitrites can turn real plants brown. Nitrites are 0, ammonia has been .50 or less and nitrates are 0 still, but what is this brown stuff? We have only done 1 partial water change in 1 month, when the ammonia started getting to .50. There's 3 zebra danios and 2 pearl danios in it.