Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
I dunno, I used to run HOB filter's and cleaned em each week with large water changes.
But is a good point bout cleaning too much in the tank all at once.
Only time I would be fearful of performing large water change is if water changes have been few and far between.
In that case,it would be best do to smaller water change's while gradually working up to larger % of water changed.
Also would be fearful of large water changes if source water was very different from tank water due to buffers used in the tank and source water did not match the tank water pH.GH.
Last edited by roadmaster; 08-11-2017 at 08:10 AM.