Your welcome! 
This is gettng off topic but algae issue are alot more complex than just PO4. You didn't post what your PO4 is but if it's between .03mg/l and .5 mg/l I would take out the pads. Corals need PO4 and a PO4 deficiency seruiously impairs their photobiology and doens;t let them compete with algae for nutrients. One of the contrdictions I've seen is PO4 increasing as nuisance algae disappears. I would only use urchins, hermits and manual removal to deal with nusance algae issues.
Again, this is off topic but here's some links you might find intersting:
"Coral Reefs in the Microbial Seas" This video compliments Rohwer's book of the same title (Paper back is ~$20, Kindle is ~$10), both deal with the conflicting roles of the different types of DOC in reef ecosystems. While there is overlap bewteen his book and the video both have information not covered by the other and together give a broader view of the complex relationships found in reef ecosystems
Changing Seas - Mysterious Microbes
Microbial view of Coral Decline
Nitrogen cycling in hte coral holobiont
BActeria and Sponges
Maintenance of Coral Reef Health (refferences at the end)
https://youtu.be/dGIPveFJ_0Q
Optical Feedback Loop in Colorful Coral Bleaching
https://youtu.be/oadKezUYkJE
DNA Sequencing and the Reef Tank Microbiome
https://www.youtube.com/watch?v=ghxVSmLhxUg
Richard Ross What's up with phosphate"
https://youtu.be/ZRIKW-9d2xI
15 Answers
https://www.youtube.com/watch?v=pqTuQDzjlv4
This is gettng off topic but algae issue are alot more complex than just PO4. You didn't post what your PO4 is but if it's between .03mg/l and .5 mg/l I would take out the pads. Corals need PO4 and a PO4 deficiency seruiously impairs their photobiology and doens;t let them compete with algae for nutrients. One of the contrdictions I've seen is PO4 increasing as nuisance algae disappears. I would only use urchins, hermits and manual removal to deal with nusance algae issues.
Again, this is off topic but here's some links you might find intersting:
"Coral Reefs in the Microbial Seas" This video compliments Rohwer's book of the same title (Paper back is ~$20, Kindle is ~$10), both deal with the conflicting roles of the different types of DOC in reef ecosystems. While there is overlap bewteen his book and the video both have information not covered by the other and together give a broader view of the complex relationships found in reef ecosystems
Changing Seas - Mysterious Microbes
Microbial view of Coral Decline
Nitrogen cycling in hte coral holobiont
BActeria and Sponges
Maintenance of Coral Reef Health (refferences at the end)
https://youtu.be/dGIPveFJ_0Q
Optical Feedback Loop in Colorful Coral Bleaching
https://youtu.be/oadKezUYkJE
DNA Sequencing and the Reef Tank Microbiome
https://www.youtube.com/watch?v=ghxVSmLhxUg
Richard Ross What's up with phosphate"
https://youtu.be/ZRIKW-9d2xI
15 Answers
https://www.youtube.com/watch?v=pqTuQDzjlv4
