Enclosed upflow scrubbers like the SURF2 can pull a lot of nutrients out of the water because the enclosed water circulates around and around before exiting the box, however if iron is low, you may get clear growth like this:
Enclosed upflow scrubbers like the SURF2 can pull a lot of nutrients out of the water because the enclosed water circulates around and around before exiting the box, however if iron is low, you may get clear growth like this:
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