![Need help: what is this on the surface? Looks like oil. New tank 8 weeks, JBL Sansibar Dark, just a few plants and seiyru stones (from another of my tanks) never saw Need help: what is this on the surface? Looks like oil. New tank 8 weeks, JBL Sansibar Dark, just a few plants and seiyru stones (from another of my tanks) never saw](https://preview.redd.it/59p7tq1ohr381.jpg?auto=webp&s=2647a1af9616ca455ae77c476cebfb61b8efb9c0)
Need help: what is this on the surface? Looks like oil. New tank 8 weeks, JBL Sansibar Dark, just a few plants and seiyru stones (from another of my tanks) never saw
![Has Anyone (experience With) Jbl Sansibar Dark? | Freshwater Substrates - Gravel, Sand Forum | 349823 Has Anyone (experience With) Jbl Sansibar Dark? | Freshwater Substrates - Gravel, Sand Forum | 349823](https://www.fishlore.com/aquariumfishforum/data/attachments/392/392850-2364c199aa0716ecccf45af12c6b6dba.jpg)
Has Anyone (experience With) Jbl Sansibar Dark? | Freshwater Substrates - Gravel, Sand Forum | 349823
![Buy JBL Sansibar DARK 10 kg, Dark substrate for freshwater and saltwater aquariums Online at desertcart Bahamas Buy JBL Sansibar DARK 10 kg, Dark substrate for freshwater and saltwater aquariums Online at desertcart Bahamas](https://m.media-amazon.com/images/I/91cdEpQWneL.jpg)