when i had an anemone it killed a few of my larger fish sadly they were buried down beneath the rocks and sand. shortly after this happened I had the same type of outbreak. my guess is the water was too rich with nutrents from the decaying fish in the tank. awhile later the outbreak disapeared. Mother nature has a weird way of taking care of herself give it time it should go away on its own. once your tank is better established perhaps feeding twice a week only will help your parameters. with a proper refugium and a light bio load your tank will start to feed itself
and everyday feeding will not be nessesary