For ostreopsis, it is pretty straightforward.
a) Elevate nutrients to 10/.1
b) Run UV at 1 watt per 3 gallons with SLOW flow
c) Run some GAC to knock down toxins
While I am a fan of MB7 under normal or high nutrient conditions, it is cross purpose when you are trying to elevate nutrients. The purpose of nutrient elevation is encourage competitors to hold space -- like film algae.
Ah, I guess I should throw some activated carbon into my system. Everything looks bad (total RTN on my acros, shriveled anemones).