Hello and thank you for your inquiry.
There are a couple of ways to help combat bryopsis in your tank. First is manual removal, but you must be careful with this approach as any pieces left floating around the tank can settledown and start a "new" patch of bryopsis growing elsewhere in the tank. Manual removal while siphoning out water works well.
Second is reducing the fuel that feeds the algae, ie nitrates and phosphates. Reduced feedings, the use of phosphate removing media and water changes can help with this.
Lastly many people have had luck elevating their magnesium levels using Kent Marine's Tech-M to help kill off bryopsis. If you do a search with the key words "bryopsis" and "Tech-M" you should be able to find lots of great information on this method.
If there is anything else we can do for you please let us know.
Marine Depot Customer Service