Read my larger post above. Your tank sounds like it’s dying. I’ve been through this exact issue. Low Co2 most likely but without knowing permameters just a guess. Reduce your flow or airflow let the co2 build a bit. Keep a balances nutrient profile and a consistent light schedule. Java ferns rapidly reproduce plantlets when their struggling an dying. If you do these steps quick you can likely save it. I can’t speak for the hair grass though usually any carpet requires co2 or insane amounts of wait time while picking the right type if moss or carpet plants is a must. Its all about balance. You got to find it fast. Or the hobby and tank become a money and time sink.
Read my larger post above. Your tank sounds like it’s dying. I’ve been through this exact issue. Low Co2 most likely but without knowing permameters just a guess. Reduce your flow or airflow let the co2 build a bit. Keep a balances nutrient profile and a consistent light schedule. Java ferns rapidly reproduce plantlets when their struggling an dying. If you do these steps quick you can likely save it. I can’t speak for the hair grass though usually any carpet requires co2 or insane amounts of wait time while picking the right type if moss or carpet plants is a must. Its all about balance. You got to find it fast. Or the hobby and tank become a money and time sink.