Sudden Algae Problem

[Davy]

Was away for 10 days and did a good clean came back to a major algae bloom.

Water params are nitrite 0
nitrate <= 5
ammonia <=0.25
200 ltr tank
Internal Juwel Filter System
External Eheim 2026
Water declorinated

My 3 year old black moor is also in a bad way its now isolated but almost bent double
but no signs of fin damage.

Bogwood is either covered in green algae or like black beardish type stuff

Help!!!

 

[GoldLenny]

When you did a "good clean" and then went away for 10 days... exactly what did you do as part of the "good clean" and what was the feeding, lighting, etc., schedule for the 10 days? I know that the "good clean" and/or the 10 days away were the likely cause but I need to know more about both of those things to give you proper advice on what happened and how to prevent it in the future.