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What we have used in the past for our filter feeders is Phyto Feast by reef nutrition.
http://www.reefnutrition.com/phytofeast.html
Phyto is good for filter feeders in your tank or if you are trying to breed fish. Depending on what you keep in your tank I think you will be fine to just pick one...
It was the fish in the bag at Rods house and the fish he went it with are also small and non-aggressive which is on purpose. If he went into any of our other tanks, then yes he would be a very expensive snack.
Good luck, I had to pull all the live rock out of our 20g to get to a coral beauty. My flame angel does come up to the surface of the water when I feed, maybe put the net in the water then feed and try and grab him? They can be quick and dart into the live rock when spooked.
The point of doing a blackout is to have a total blackout. People who have done it have had positive results. As far as corals go it seems that softies and LPS are fine, your SPS may lose a bit of color but will rebound. Remember in nature it is not sunny every single day.