First , rinse the frozen food inside the fishing net in 1 qt. RO/DI water , keep doing for 2 weeks , monitor PO4 in tank also the glass around the tank and polyps on Corals. Put OFF return pump one hour.
Then , NO rinse the frozen food, cut one Coca-Cola plastic bottle , use that like that fancy feeder , same , monitor PO4 in tank also around the tank and polyps on Corals.Put OFF return pump one hour.
Then , you the judge.
PO4 is NOT a pleasure to deal.