Hi guys - Our class fishtank has a yucky black hair like algee growing in it and we are worried it will be bad for our fish. We have a Betta called Zeus a Bristle nose called Mr Bris. They live with some Cardinal Tetras in our 40l tank. We have an underground filter system. The stuff is growing all over the filter, Mr Bris' log, the heater and our floating plant. When one of us cleaned the tank this morning the water coming out smelt like when you tip a vase that has had dead flowers in it out.
Do you have any ideas on how we can fix this as we are very attachted to Zeus and Mr Bris and we are concerned.
Miss Hdoubleu's Class