algae may adapt to a wide range of

algae may adapt to a wide range of salinity,but many species do not tolerate a large sudden change in salinity.unfortunately,with few exceptions the nuisance algae are not among the nuisance algae are not among the intolerant algae.if they were,controlling them would be as simple as performing a water change to drop or raise the salinity.for some varieties of cyanobacteria this may in fact resolve a problem bloom,but for most it does not,and filamentous green and red algae tolerate aslinity changes quite well.caulerpa species,however,do not tolerate wide fulctuations in salinity,and it might be possible to eliminate a problem species affecting some rocks in the aquarium by removing the affected rocks and exposing them to a specific gravity change of .010 points difference in a holding tank.maintain the rocks at this specific gravity for a few hours before replacing them in the aquarium.for example,if the aquarium has a specific gravity of 1.024,make a batch of seawater at a specific gravity of 1.014 or 1.034 in the holding tank.beware that this change will also kill many coralline algae,as well as sponges on the live rocks.