I started a planted tank with Monte Carlo. Everything was fine till first 4 months and the carpet was also coming up well. But after that black algae started to come all over the substrate and leaves.
I tested my tank for phosphates and its zero. Still used sechem Phosguard as it removes silicates as well.
Not sure about nitrates but I do a 60% water change every week.
I also use pressurized CO2.
Also, I have 2 small tetra , 2 siamese algae eaters and 4 Amano Shrimps.
Any help or suggestions are appreciated. Thanks.