it's very important to place rock in the aquarium BEFORE sand.
The order to do this is rock (ensure it's stable), water and lastly sand.
Obviously you can do this in any order you wish, but there are ways and then there are better ways
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some common aquarium nuisances: Bryopsis,Derbesia(hair algae),Cyanobacteria(red slime), Diatoms(golden brown algae), Dinoflagellates(gooey air bubbles),Valonia (bubble algae)
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