I change about one third of the water regularly every weekend. It’s part of my to-do-list on weekends ……. so I don’t question it, just do it. Like doing the laundry ……… (But much more fun!!)
There is a (very interesting!!) thread about blackwater at the IGL-forum, primary initialized by my question about what might have happend to my P. nagyi-clutch …….. I was critized there when I dared to show my astonishment about the serious advice to change more than 50% every week ….. (which, by the way, contradicts the recommendations given in the species descriptions on the IGL homepage….)