I have a protein skimmer. But what about hermits or other crabs that are bottom dwellers?
still wont eat it
Parrot is too big for 55. Save yourself the trouble, trade him in or start a bigger tank. The Princess Parrot is 13.5", but needs a 135 gal aquarium because of the waste it produces. A Pterios Volitans get up to 15" but will live a full life in a 55 gal. These are minimum for the fish to live a ful life. Depending on the species of parrot you are keeping, is how big of a tank you need.
Nothing replaces just cleaning the tank.