Over the last few years we've made somewhere around 10 scrubbers, both waterfall and recently a few upflow. That, along with small tweaks to existing models, have predominantly resulted in a lot of information about what DOESN'T work, as opposed to what does. While some of the screens have been full and heavy with long thick green 'silly string' algae, most variations have produced thin transparent algae, purple macro algae, or basically no growth. Since there is a section of scrubbers that succeeded on the forum here, what about making a section for ones that failed. After all, knowing is half the battle.