question

  • We are currently upgrading MFK. thanks! -neo
That is a brown algae. Purchasing another pleco to fix this is a bad choice. An algae scraper is a much better choice.
 
is it because its harmful? this is going to be my new tank, the other plecos with my 20gal. sry for all the questions
 
No, it's because plecos are not the problem. Find the route of algea growth, and stop it that way.
 
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