Play Sand Turning Black Along Glass
The sand along the front and sides of the tank is turning black. What is it and do I need to fix anything? Will it go away?
Tank is an Evolve4 with play sand substrate that's been running for about a month. It has a few baby mystery snails, MTS and a pair of scarlet badis plus lots of plants. There are a couple of O+ tabs in there. I do partial water changes every week and carefully vacuum the sand with a straw to get in the small places (snails poop a lot). There are some blackworms in there but this started before they were introduced to the tank. It also has extra filter media. Before the DHG rooted I stirred the sand every couple of days. I haven't done that recently and am not sure how without uprooting something. I did suck some of the icky sand up and it didn't release bubbles nor did it smell particularly bad - normal mulm smell if anything.
Last edited by Elli; 11-11-2013 at 06:29 PM.