I would consider plant decomposition to be bad. When plants decompose, they release a lot of nutrients and organic matter into the water. This will fuel bacteria growth (water cloudiness) and oxygen uptake, which could hurt/kill the fish. Keep your water oxygenated to protect fish.
Healthy plants take up nutrients and purify the water for fish. Dying plants release nutrients and contaminate the water.
Healthy plants take up nutrients and purify the water for fish. Dying plants release nutrients and contaminate the water.
