The algae is not harmful... just that if they are introduced into a tank and start to grow alot, your tank and plants may eventually be covered in the algae. Looks unsightly and plants get smothered and deteriorate.
Once pest algae establish in the tank, it can be very difficult to get rid off, since everything is already setup with livestock inside, you have very limited options.
It's always better to treat and remove algae outside separately, then you will not have issues later.
Here is an example of how i treat and quarantine new plants that i get from LFS (requires extra time and effort though): http://www.urbanaquaria.com/2015/09/...uarantine.html
On the otherhand, if you don't mind an algae filled tank, then it's okay to just let the algae intro in.![]()









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