Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
Have seen black brush algae in tank's of mine holding nothing but gravel and cichlid's so plant's introducing the stuff in my case was not the issue.
Have seen it in store tank's as well with no plant's only fishes.
I do not doubt that plant's may carry spores with them, but suppose the plant's we purchase came from tank's with no algae, or tank was started and run for month's without issues or new plant's being introduced.
Has to be a trigger in my view ,and considering lot's of folk's over feed,over stock,perhaps are lazy at times with maint,and often times blast the lighting upon the plant's, while maybe not being able to also increase CO2 and nutrient's,,it might create such a trigger with excess organic matter in filter's,on substrate, and plant's that are struggling for More CO2 and or nutrient's due to possibly all of the above.
Seldom see the stuff in true Guru's tank's where everything is kept meticulously clean.(hmm)
I am often troubled by how the stuff appear's on hard object's like filter inlet /outlet pipes and maybe on one rock out of many,or one piece of wood out of a few.