I do use mysis with Ocean Nutrition's prime reef flakes mixed in. I give the frozen mysis a real good rinse several times before I drain all the water and slightly drying with a paper towel before mixing. You're right, the uneaten food is one of the main source of some of these different problems I've been running into. As much as I try to feed the fishes on top of my anemones, I do know that sometimes the food flies around after the fishes go after them. This is why I try to time the feeding to where the food is still semi frozen so the left over particles don't fly everywhere. I did lower the flow a bit once I noticed the flow was a little on the high side which the corals appreciated and maybe there was less cyanobacteria flying everywhere. Things have gotten much better since then. I'll just keep at it, removing as much as I can with the smallest water changes needed to replenish the saltwater. I'm going to stay away from chemicals for as long as I can lol. Thanks for taking the time to comment!!
Manual removal is a futile effort against cyano. It has the ability to double itself every 20 minutes.
More flow is often recommended, but it is to short of a sentence. You need more flow in areas with low flow, not over the whole tank. Sometimes having 2 pumps alternating is better than having just one. 4 is better than 2.
Boosting pod populations and probiotics can help to compete with the cyano for nutrients, but it can only go so far.
To get over it you are going to need to balance out your nutrients, and adjust the watermovement so things are not decaying in the tank. A protein skimmer can help. Growing macro algaes can help.
If your tank does not have any acro's in it 3 days without light will kill cyano. It's no light though, not just tank lights off. If you do it part way, or turn the lights on to feed the fish or whatever other idea, the strongest cells of the bacteria will survive and proliferate and it will be worse.
Personally I would avoid chemical treatments.
Doing a 20% water change one day a week, adding a powerhead or two that oscillate, and a few days without light should do the whole trick. If it comes back after the lights out period you have not solved your nutrient issues.
Best of Luck.