Well I'm strongly thinking of pulling the plug on these. I have gone down to 6 hrs and I think that what little growth that would grow on the screen has slowed down even more. So my thinking is that 6 hours is not enough hours to get good growth. If I add more then it just burns all but the outer 1/2'' or so. The 2nd Hog.5 looks the same as this one really. It is at 11 weeks now and I have a hard time believing that more time will change anything. Not sure why they work for others but it is not working for me. Maybe it is not capable of removing algae in a Zeo system? Soon I will fine out if the waterfall type does.
This is 5 days growth.
Here is the display. So I know there is enough nutrients.