Which Cleaner Fish?

My aquarium setup includes the following - 5 foot 2 inch fish tank (sorry dont know the gallons) - 9 goldfish -2 baby turtles that are starting to get quite big!

I do my best to keep the tank clean but i need just a bit of a hand. I am looking to get some cleaning fish, i dont know much about them or what they are called i just call them sucker fish. Any help from the fish keepers of the world would be great.... advice on cleaning fish that are easy to look after and preferably cheap.

As it may help in answering the question, my fish tank has blue gravel and large brown rocks randomly placed, a big bit of wood and a floating turtle rock.

The goldfish are as small as a $.50 coin and dont take up much room in thetank and the turtle just smaller than the palm of my hand, i know i have more room for a cleaning fish (i am not trying to get out of cleaning my tank just something to keep it cleaner for longer!)

I want to buy one tomorrow after work so any help on cleaner fish wood be brilliant, thanks!

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