Black stuff growing on plants
Hey all, I’m really new to this. Have a really small tank (2.5g) and have a really nice Anuba? I have no idea what the water parameters are but it’s crystal clear, I do regular changes using only rain water which has been tested by the shop to be very pure (with some salts added) and have a successful shrimp colony growing so I figure it must be OK. Why is this black stuff growing and why is my plant looking so sick? What can I do about it?