algae scrubber good or bad ?

I've heard nothing but good things. The only thing that's "bad" is that the size of the scrubber depends on the size of your tank. So some people would need a lot of extra space to set one up.
 
Yes, It work wonderfully .My tank is 4 mons old started with dry rock , all I can see during four mons was all type algae, water changed,chemical used were only temporary help,put algae scrubber in use almost a week with 16 hour light on opposite with mh light scheduled .Today , I can see how clean my rock , sand & glass View attachment 1580View attachment 1581
 
I use one with my refugium and phosphate rector. No algae in my DT! Woot. I've read somewhere that the algae makes chemicals that inhibit hard coral growth, but haven't noticed any difference.

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