FYI, they do float quite well. I am going to build a smaller version and see if I can wedge it under some rocks in the corner of my tank. hidden but effective.
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Better on the scrubber than on the glass or rocks!!!
Algae scrubber growth day 7. It's brown algae.
No let it build up more. It will work more effectively if you leave some algae on it after cleaning it, you need algae to grow algae, so your next 7 days should be even better.
Not necessarily i clean my screens completely and get tons of growth after 7 days. Even if i put on a new screen i get full sheet of algae after 1 week. What bulbs are you using and how close are the lights? My build thread somewhere has a pic of a new screen after 7 days full of gha. I find that the more algae you leave on the more dark algae grows and the less filtering it seems to do.