Article: Reach into your aquarium and slowly cut if your moss is getting too long. Shape the moss however you want it. For example, if you have made a tree, you may want to make the moss round and neat.  You can let moss grow freely, but it may restrict water flow or make it hard for fish to move around your aquarium. Disinfect the scissors with warm water before putting them in your tank. Any added chemicals could harm the health of your plants and fish. Move the siphon up and down in the water to create suction and start the water flow. Hold the siphon near your moss to suck any food or plant particles. Control the suction with your thumb at the end of the hose. Have a bucket ready to drain 20 percent of the water from the tank. Algae forms in water with poor circulation and under bright lights. Though your moss will help prevent algae, it may get into your aquarium. Once algae have grown on your moss, it’s very hard to get rid of and should be removed. If you are set on keeping the moss, gently use a soft toothbrush to scrub the moss. Be careful not to detach it from its base. Take any sized cutting from the moss with a pair of scissors and place it somewhere else in the tank. The cutting will form a new plant and continue to grow wherever it’s attached.
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Trim the moss every week with a clean pair of scissors. Use a water siphon to change the water and vacuum the moss weekly. Replace the moss if algae start to grow on it. Cut off pieces from the moss if you want to propagate it.