The number of algae eater may be inadequate??
This means algae growth is out of control. Excess algae growth can soon smother other (desirable) growth changing the appearance from a vibrant looking aquarium to a dull lifeless one. This change is gradual and is usually noted by someone who hasn’t seen your aquarium for a while. TAKE HEED. IF action isn’t taken quickly the set-up can quickly pass to a point of almost non-return.