DrConnie
Aquarium Advice Activist
I have a 29 gallon freshwater aquarium set up, fully cycled and stable water conditions (via API master test kit) for several months. Currently there are 4 African Dwarf Frogs and a Mystery Snail residing there. Recently (in the past 3 weeks or so) I have noticed a black substance starting to appear on everything- sides of tank, decorations, gravel, everything. The residents of the tank are healthy and thriving- active, eating well, no problems with them at all. I change the water (30 - 50%) and test the water every week, and have been wiping down decorations & such with a clean cloth (dedicated to the tank & not washed with soap of any kind) each time.
Any ideas what this stuff might be?
Any ideas what this stuff might be?