Hang on the back refugium

[feeshna]

I read about these online. Are they any good? I don't have room for a real refugium but I do for these.

[Sniperhank]

It depends on the size. The larger the macro algae that you can house then the better results you will end up getting in terms of nitrate reduction. Overall, I would not look for large numbers being reduced from a HOB refugium.

[feeshna]

Ok thanks