However if left without any form of water feature servicing then you will likely find that your water features begin to acquire algae and stains and that they no longer look as clean and as fresh as they once did. Slowly custom aquariums will start to turn green, and meanwhile water falls and water walls will start to go stagnant and yellow. This makes the water look infected and dirty and makes the room feel badly cared for as a result. Likewise if you have custom aquariums in particular then this can be very unhealthy for the fish and might even result in their dying. In some cases if the water has gone stale then this can result in the water features smelling even and of course this has quite the opposite impact that most people are going for. At the same time the glass and the walls themselves in your water features can also start to get dirty. In a custom aquarium for instance you might find that the glass starts to get misty or dirty and this means that light struggles to get in and out. This has many bad effects on your water features. Again it is very unhealthy for your fish, but it will also make the water look even dirtier.