If your tests are accurate and show no phosphate or nitrates it is because your algae are consuming them.
Stop the nitrate and phosphate introduction (food and dead stuff) and your algae will decline. Maybe less light for a while will help.
Snails
-----bumblebee snails are predatory and should not be placed in any reef aquarium (who gave you the info that they eat algae?)
-----astraea eat algae but fall on their shell backs and cannot right themselves and die and pollute the tank
-----trochus are excellent algae eaters
-----nerita are probably OK
-----ceriths add one to your tank
-----cowries get a few ring (money) cowries
-----nassarius are scavengers. They eat meat not detritus.
-----margarita are cool water snails; not for our tanks
You need to acclimate snails for hours otherwise they die for no apparent reason.
All the above courtesy Ron Smimek: A pocket guide to Marine Invertebrates: a must have for thirty bucks.
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