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Why does this box seem to favour unicellular growth, instead of GHA?

I'm curious - considering your not exporting algae, are you waterchanging at all.

Yuk. I can see why you are concerned. These bubbly things do work though, don't they? If not, I'll try one of Floyds waterfall scrubbers.

I'm lazy and ain't searched, but have you got a photo of your tank mate?

I'm new but I thought the aim was to grow green algae, not slime. Perhaps it's got it's benefits though ;)

It's a bit sad when folks have spent $300 on summit that don't work :(

That's confused me. I thought it was the tank he wanted filtering. So growing algae on rubbish water is no good, it's gotta be clean to grow?