It most likely is just the algea photosynthesizing. But, not as common, could be a high concentration of ammonia. Which is very bad for the aquarium. But if the fish are OK, they it's just photosynthesis which produces oxygen for the fish. It's actually very beneficial. 😊
It most likely is just the algea photosynthesizing. But, not as common, could be a high concentration of ammonia. Which is very bad for the aquarium. But if the fish are OK, they it's just photosynthesis which produces oxygen for the fish. It's actually very beneficial. 😊