Cactuspixie
Aquarium Advice Addict
I've tried this before.Your best bet is to remove the impeller and NOT plug in the filter that the water will go through first.Using both motors just doesn't work well.This makes for a very good biological filter and will work well,the draw back will be is if the filter the first one will be able to be opened and cleaned easily.Keeping it clean and leaving your second filter closed will help keeping your good bacteria strong.Although if a disease breaks out you have to tear them both apart and clean.I'll advise as others to use the both independently.For me this is the fun part about aquarium keeping is building and tring your own ideas.
Hmmmm..... Food for thought! How long did you run that setup?