Need Recommendations: Unwanted Aptaisa in sump/refuge

[Jeff_]

The other choice is put in a UV sterilizer on the return pump line (depending on the flow) so any aiptasia clones don't make it through into the Display. I remember an article a while back where the tank had a cryptic filtration zone (no light) and they had a UV sterilizer to get rid of the budding aiptasia. Apparently they make pretty good filters just like sponges.