For starters, you can get small SAEs (Siamese Algae Eaters)(Scientific Name: Crossocheilus siamensis) and Otos (Scientific Name: Otocinclus affinis), both of wich are excellent starters for "cleaner" fishes.
Another type are Plecos which are also good for this purpose.
Going a bit further, you can also engage other efficient helpers as part of your cleaning crew which is the Amano/Yamato shrimps.
In general, they are not garbage eaters but feed mainly on algae and other microscopic plants/organisms found in fish wastes.
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